161843788 has 12 divisors (see below), whose sum is σ = 283380552. Its totient is φ = 80877920.

The previous prime is 161843779. The next prime is 161843807. The reversal of 161843788 is 887348161.

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, 1873 + ... + 18088.

It is an arithmetic number, because the mean of its divisors is an integer number (23615046).

Almost surely, 2^161843788 is an apocalyptic number.

It is an amenable number.

161843788 is a deficient number, since it is larger than the sum of its proper divisors (121536764).

161843788 is a wasteful number, since it uses less digits than its factorization.

161843788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21992 (or 21990 counting only the distinct ones).

The product of its digits is 258048, while the sum is 46.

The square root of 161843788 is about 12721.7839943932. The cubic root of 161843788 is about 544.9609017206.

The spelling of 161843788 in words is "one hundred sixty-one million, eight hundred forty-three thousand, seven hundred eighty-eight".