156499640 has 64 divisors (see below), whose sum is σ = 394558560. Its totient is φ = 55365120.

The previous prime is 156499597. The next prime is 156499643. The reversal of 156499640 is 46994651.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 156499591 and 156499600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156499643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11474 + ... + 21086.

Almost surely, 2^156499640 is an apocalyptic number.

156499640 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 156499640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197279280).

156499640 is an abundant number, since it is smaller than the sum of its proper divisors (238058920).

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

156499640 is a wasteful number, since it uses less digits than its factorization.

156499640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9672 (or 9668 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 156499640 is about 12509.9816146947. The cubic root of 156499640 is about 538.8953641873.

The spelling of 156499640 in words is "one hundred fifty-six million, four hundred ninety-nine thousand, six hundred forty".