156509540 has 48 divisors (see below), whose sum is σ = 359783424. Its totient is φ = 56716800.

The previous prime is 156509501. The next prime is 156509567. The reversal of 156509540 is 45905651.

It is a super-2 number, since 2×156509540² = 48990472222023200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 156509540.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 73085 + ... + 75195.

It is an arithmetic number, because the mean of its divisors is an integer number (7495488).

Almost surely, 2^156509540 is an apocalyptic number.

156509540 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 156509540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179891712).

156509540 is an abundant number, since it is smaller than the sum of its proper divisors (203273884).

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

156509540 is a wasteful number, since it uses less digits than its factorization.

156509540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468 (or 2466 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 156509540 is about 12510.3772924720. The cubic root of 156509540 is about 538.9067272627.

The spelling of 156509540 in words is "one hundred fifty-six million, five hundred nine thousand, five hundred forty".