161857732 has 24 divisors (see below), whose sum is σ = 298756640. Its totient is φ = 76515840.

The previous prime is 161857711. The next prime is 161857733. The reversal of 161857732 is 237758161.

It is not an unprimeable number, because it can be changed into a prime (161857733) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 42007 + ... + 45697.

Almost surely, 2^161857732 is an apocalyptic number.

It is an amenable number.

161857732 is a deficient number, since it is larger than the sum of its proper divisors (136898908).

161857732 is a wasteful number, since it uses less digits than its factorization.

161857732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4291 (or 4289 counting only the distinct ones).

The product of its digits is 70560, while the sum is 40.

The square root of 161857732 is about 12722.3320189343. The cubic root of 161857732 is about 544.9765520311.

The spelling of 161857732 in words is "one hundred sixty-one million, eight hundred fifty-seven thousand, seven hundred thirty-two".