161815938 has 32 divisors (see below), whose sum is σ = 328423680. Its totient is φ = 53145600.

The previous prime is 161815919. The next prime is 161815949. The reversal of 161815938 is 839518161.

161815938 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 161815938.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155223 + ... + 156261.

It is an arithmetic number, because the mean of its divisors is an integer number (10263240).

Almost surely, 2^161815938 is an apocalyptic number.

161815938 is an abundant number, since it is smaller than the sum of its proper divisors (166607742).

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

161815938 is a wasteful number, since it uses less digits than its factorization.

161815938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402.

The product of its digits is 51840, while the sum is 42.

The square root of 161815938 is about 12720.6893681121. The cubic root of 161815938 is about 544.9296410588.

The spelling of 161815938 in words is "one hundred sixty-one million, eight hundred fifteen thousand, nine hundred thirty-eight".