12978840 has 64 divisors (see below), whose sum is σ = 44501760. Its totient is φ = 2966400.

The previous prime is 12978829. The next prime is 12978851. The reversal of 12978840 is 4887921.

It is an interprime number because it is at equal distance from previous prime (12978829) and next prime (12978851).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6886 + ... + 8565.

It is an arithmetic number, because the mean of its divisors is an integer number (695340).

Almost surely, 2^12978840 is an apocalyptic number.

12978840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12978840 is an abundant number, since it is smaller than the sum of its proper divisors (31522920).

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

12978840 is a wasteful number, since it uses less digits than its factorization.

12978840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15472 (or 15468 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 12978840 is about 3602.6157163927. The cubic root of 12978840 is about 235.0058245123.

The spelling of 12978840 in words is "twelve million, nine hundred seventy-eight thousand, eight hundred forty".