156161440 has 24 divisors (see below), whose sum is σ = 368931780. Its totient is φ = 62464512.

The previous prime is 156161431. The next prime is 156161449. The reversal of 156161440 is 44161651.

It is an interprime number because it is at equal distance from previous prime (156161431) and next prime (156161449).

It can be written as a sum of positive squares in 2 ways, for example, as 147185424 + 8976016 = 12132^2 + 2996^2 .

It is a junction number, because it is equal to n+sod(n) for n = 156161399 and 156161408.

It is not an unprimeable number, because it can be changed into a prime (156161449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487845 + ... + 488164.

Almost surely, 2^156161440 is an apocalyptic number.

156161440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156161440 is an abundant number, since it is smaller than the sum of its proper divisors (212770340).

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

156161440 is an equidigital number, since it uses as much as digits as its factorization.

156161440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976024 (or 976016 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 156161440 is about 12496.4570979138. The cubic root of 156161440 is about 538.5068950177.

It can be divided in two parts, 1561 and 61440, that added together give a square (63001 = 251²).

The spelling of 156161440 in words is "one hundred fifty-six million, one hundred sixty-one thousand, four hundred forty".