1491132240 has 400 divisors, whose sum is σ = 5767297536. Its totient is φ = 354585600.

The previous prime is 1491132229. The next prime is 1491132277. The reversal of 1491132240 is 422311941.

It is a happy number.

1491132240 is a `hidden beast` number, since 1 + 491 + 132 + 2 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2611155 + ... + 2611725.

Almost surely, 2^1491132240 is an apocalyptic number.

1491132240 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 1491132240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2883648768).

1491132240 is an abundant number, since it is smaller than the sum of its proper divisors (4276165296).

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

1491132240 is a wasteful number, since it uses less digits than its factorization.

1491132240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1491132240 is about 38615.1814705046. The cubic root of 1491132240 is about 1142.4539934582.

The spelling of 1491132240 in words is "one billion, four hundred ninety-one million, one hundred thirty-two thousand, two hundred forty".