161857032 has 32 divisors (see below), whose sum is σ = 405367200. Its totient is φ = 53855744.

The previous prime is 161856979. The next prime is 161857103. The reversal of 161857032 is 230758161.

It is a junction number, because it is equal to n+sod(n) for n = 161856984 and 161857002.

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 7 ways as a sum of consecutive naturals, for example, 8344 + ... + 19832.

It is an arithmetic number, because the mean of its divisors is an integer number (12667725).

Almost surely, 2^161857032 is an apocalyptic number.

161857032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161857032 is an abundant number, since it is smaller than the sum of its proper divisors (243510168).

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

161857032 is a wasteful number, since it uses less digits than its factorization.

161857032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12085 (or 12081 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 161857032 is about 12722.3045082249. The cubic root of 161857032 is about 544.9757663943.

The spelling of 161857032 in words is "one hundred sixty-one million, eight hundred fifty-seven thousand, thirty-two".