161405884 has 12 divisors (see below), whose sum is σ = 282624664. Its totient is φ = 80655984.

The previous prime is 161405879. The next prime is 161405897. The reversal of 161405884 is 488504161.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 3339 + ... + 18274.

Almost surely, 2^161405884 is an apocalyptic number.

It is an amenable number.

161405884 is a deficient number, since it is larger than the sum of its proper divisors (121218780).

161405884 is a wasteful number, since it uses less digits than its factorization.

161405884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23484 (or 23482 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 161405884 is about 12704.5615430049. The cubic root of 161405884 is about 544.4689538629.

The spelling of 161405884 in words is "one hundred sixty-one million, four hundred five thousand, eight hundred eighty-four".