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1491143940 = 223251113193049
BaseRepresentation
bin101100011100001…
…0000110100000100
310211220211221221100
41120320100310010
511023213101230
6403544220100
751644341266
oct13070206404
93756757840
101491143940
116a5791570
1235746a630
131a9c112c0
14102079b36
158ad9a660
hex58e10d04

1491143940 has 288 divisors, whose sum is σ = 5595408000. Its totient is φ = 316016640.

The previous prime is 1491143911. The next prime is 1491143947. The reversal of 1491143940 is 493411941.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1491143895 and 1491143904.

It is not an unprimeable number, because it can be changed into a prime (1491143947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 487536 + ... + 490584.

It is an arithmetic number, because the mean of its divisors is an integer number (19428500).

Almost surely, 21491143940 is an apocalyptic number.

1491143940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1491143940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2797704000).

1491143940 is an abundant number, since it is smaller than the sum of its proper divisors (4104264060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1491143940 is a wasteful number, since it uses less digits than its factorization.

1491143940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3107 (or 3102 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1491143940 is about 38615.3329650283. The cubic root of 1491143940 is about 1142.4569814956.

The spelling of 1491143940 in words is "one billion, four hundred ninety-one million, one hundred forty-three thousand, nine hundred forty".