161982380 has 24 divisors (see below), whose sum is σ = 388758048. Its totient is φ = 55536768.

The previous prime is 161982377. The next prime is 161982397. The reversal of 161982380 is 83289161.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578369 + ... + 578648.

It is an arithmetic number, because the mean of its divisors is an integer number (16198252).

Almost surely, 2^161982380 is an apocalyptic number.

161982380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161982380 is an abundant number, since it is smaller than the sum of its proper divisors (226775668).

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

161982380 is a wasteful number, since it uses less digits than its factorization.

161982380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157033 (or 1157031 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 161982380 is about 12727.2298635642. The cubic root of 161982380 is about 545.1164131424.

The spelling of 161982380 in words is "one hundred sixty-one million, nine hundred eighty-two thousand, three hundred eighty".