12913820 has 12 divisors (see below), whose sum is σ = 27119064. Its totient is φ = 5165520.

The previous prime is 12913819. The next prime is 12913843. The reversal of 12913820 is 2831921.

It is a self number, because there is not a number n which added to its sum of digits gives 12913820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322826 + ... + 322865.

It is an arithmetic number, because the mean of its divisors is an integer number (2259922).

Almost surely, 2^12913820 is an apocalyptic number.

12913820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12913820 is an abundant number, since it is smaller than the sum of its proper divisors (14205244).

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

12913820 is a wasteful number, since it uses less digits than its factorization.

12913820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645700 (or 645698 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 12913820 is about 3593.5803873018. The cubic root of 12913820 is about 234.6127317005.

The spelling of 12913820 in words is "twelve million, nine hundred thirteen thousand, eight hundred twenty".