161704218 has 16 divisors (see below), whose sum is σ = 348286176. Its totient is φ = 49755120.

The previous prime is 161704199. The next prime is 161704223. The reversal of 161704218 is 812407161.

It is a super-2 number, since 2×161704218² = 52296508237983048, which contains 22 as substring.

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, 1036488 + ... + 1036643.

It is an arithmetic number, because the mean of its divisors is an integer number (21767886).

Almost surely, 2^161704218 is an apocalyptic number.

161704218 is an abundant number, since it is smaller than the sum of its proper divisors (186581958).

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

161704218 is a wasteful number, since it uses less digits than its factorization.

161704218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2073149.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 161704218 is about 12716.2973384551. The cubic root of 161704218 is about 544.8042031563.

The spelling of 161704218 in words is "one hundred sixty-one million, seven hundred four thousand, two hundred eighteen".