161904312 has 32 divisors (see below), whose sum is σ = 449734800. Its totient is φ = 53968032.

The previous prime is 161904293. The next prime is 161904359. The reversal of 161904312 is 213409161.

161904312 is a `hidden beast` number, since 1 + 619 + 0 + 43 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374563 + ... + 374994.

Almost surely, 2^161904312 is an apocalyptic number.

161904312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161904312 is an abundant number, since it is smaller than the sum of its proper divisors (287830488).

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

161904312 is a wasteful number, since it uses less digits than its factorization.

161904312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749572 (or 749562 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 161904312 is about 12724.1625264691. The cubic root of 161904312 is about 545.0288254540.

It can be divided in two parts, 16190 and 4312, that added together give a palindrome (20502).

The spelling of 161904312 in words is "one hundred sixty-one million, nine hundred four thousand, three hundred twelve".