161783976 has 16 divisors (see below), whose sum is σ = 404460000. Its totient is φ = 53927984.

The previous prime is 161783971. The next prime is 161783977. The reversal of 161783976 is 679387161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (161783971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3370476 + ... + 3370523.

It is an arithmetic number, because the mean of its divisors is an integer number (25278750).

Almost surely, 2^161783976 is an apocalyptic number.

It is an amenable number.

161783976 is an abundant number, since it is smaller than the sum of its proper divisors (242676024).

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

161783976 is a wasteful number, since it uses less digits than its factorization.

161783976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6741008 (or 6741004 counting only the distinct ones).

The product of its digits is 381024, while the sum is 48.

The square root of 161783976 is about 12719.4330062311. The cubic root of 161783976 is about 544.8937603986.

The spelling of 161783976 in words is "one hundred sixty-one million, seven hundred eighty-three thousand, nine hundred seventy-six".