12171980 has 24 divisors (see below), whose sum is σ = 26045712. Its totient is φ = 4776512.

The previous prime is 12171979. The next prime is 12171997. The reversal of 12171980 is 8917121.

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, 4682 + ... + 6801.

It is an arithmetic number, because the mean of its divisors is an integer number (1085238).

Almost surely, 2^12171980 is an apocalyptic number.

12171980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12171980 is an abundant number, since it is smaller than the sum of its proper divisors (13873732).

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

12171980 is a wasteful number, since it uses less digits than its factorization.

12171980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11545 (or 11543 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 12171980 is about 3488.8364822674. The cubic root of 12171980 is about 230.0313756819.

The spelling of 12171980 in words is "twelve million, one hundred seventy-one thousand, nine hundred eighty".