Search a number
-
+
1221302340 = 2233543149353
BaseRepresentation
bin100100011001011…
…1001100001000100
310011010002120212000
41020302321201010
510000123133330
6321104425300
742156620136
oct11062714104
93133076760
101221302340
11577436585
122a1018230
1316604260b
14b82b7056
1572347560
hex48cb9844

1221302340 has 192 divisors, whose sum is σ = 3925152000. Its totient is φ = 315076608.

The previous prime is 1221302333. The next prime is 1221302363. The reversal of 1221302340 is 432031221.

1221302340 is a `hidden beast` number, since 1 + 2 + 21 + 302 + 340 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3459604 + ... + 3459956.

It is an arithmetic number, because the mean of its divisors is an integer number (20443500).

Almost surely, 21221302340 is an apocalyptic number.

1221302340 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 1221302340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1962576000).

1221302340 is an abundant number, since it is smaller than the sum of its proper divisors (2703849660).

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

1221302340 is a wasteful number, since it uses less digits than its factorization.

1221302340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563 (or 555 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1221302340 is about 34947.1363633703. The cubic root of 1221302340 is about 1068.9098105129.

Adding to 1221302340 its reverse (432031221), we get a palindrome (1653333561).

The spelling of 1221302340 in words is "one billion, two hundred twenty-one million, three hundred two thousand, three hundred forty".