161942904 has 24 divisors (see below), whose sum is σ = 438595560. Its totient is φ = 53980944.

The previous prime is 161942897. The next prime is 161942927. The reversal of 161942904 is 409249161.

It is a happy number.

161942904 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1124532 + ... + 1124675.

It is an arithmetic number, because the mean of its divisors is an integer number (18274815).

Almost surely, 2^161942904 is an apocalyptic number.

It is an amenable number.

161942904 is an abundant number, since it is smaller than the sum of its proper divisors (276652656).

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

161942904 is a wasteful number, since it uses less digits than its factorization.

161942904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249219 (or 2249212 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 161942904 is about 12725.6789209849. The cubic root of 161942904 is about 545.0721269185.

The spelling of 161942904 in words is "one hundred sixty-one million, nine hundred forty-two thousand, nine hundred four".