12920840 has 32 divisors (see below), whose sum is σ = 29220480. Its totient is φ = 5141952.

The previous prime is 12920839. The next prime is 12920857. The reversal of 12920840 is 4802921.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8369 + ... + 9791.

It is an arithmetic number, because the mean of its divisors is an integer number (913140).

Almost surely, 2^12920840 is an apocalyptic number.

12920840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12920840 is an abundant number, since it is smaller than the sum of its proper divisors (16299640).

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

12920840 is a wasteful number, since it uses less digits than its factorization.

12920840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661 (or 1657 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 12920840 is about 3594.5569963488. The cubic root of 12920840 is about 234.6552361139.

The spelling of 12920840 in words is "twelve million, nine hundred twenty thousand, eight hundred forty".