161404772 has 12 divisors (see below), whose sum is σ = 297324720. Its totient is φ = 76454856.

The previous prime is 161404751. The next prime is 161404801. The reversal of 161404772 is 277404161.

161404772 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061798 + ... + 1061949.

It is an arithmetic number, because the mean of its divisors is an integer number (24777060).

Almost surely, 2^161404772 is an apocalyptic number.

It is an amenable number.

161404772 is a deficient number, since it is larger than the sum of its proper divisors (135919948).

161404772 is a wasteful number, since it uses less digits than its factorization.

161404772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123770 (or 2123768 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 161404772 is about 12704.5177791209. The cubic root of 161404772 is about 544.4677034937.

The spelling of 161404772 in words is "one hundred sixty-one million, four hundred four thousand, seven hundred seventy-two".