161900432 has 20 divisors (see below), whose sum is σ = 314419980. Its totient is φ = 80759808.

The previous prime is 161900393. The next prime is 161900449. The reversal of 161900432 is 234009161.

It can be written as a sum of positive squares in 2 ways, for example, as 18284176 + 143616256 = 4276^2 + 11984^2 .

It is an unprimeable number.

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, 4757 + ... + 18612.

It is an arithmetic number, because the mean of its divisors is an integer number (15720999).

Almost surely, 2^161900432 is an apocalyptic number.

It is an amenable number.

161900432 is a deficient number, since it is larger than the sum of its proper divisors (152519548).

161900432 is a wasteful number, since it uses less digits than its factorization.

161900432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23810 (or 23804 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 161900432 is about 12724.0100597257. The cubic root of 161900432 is about 545.0244715886.

Adding to 161900432 its reverse (234009161), we get a palindrome (395909593).

The spelling of 161900432 in words is "one hundred sixty-one million, nine hundred thousand, four hundred thirty-two".