12945820 has 24 divisors (see below), whose sum is σ = 27561744. Its totient is φ = 5106816.

The previous prime is 12945811. The next prime is 12945841. The reversal of 12945820 is 2854921.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2974 + ... + 5893.

It is an arithmetic number, because the mean of its divisors is an integer number (1148406).

Almost surely, 2^12945820 is an apocalyptic number.

12945820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12945820 is an abundant number, since it is smaller than the sum of its proper divisors (14615924).

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

12945820 is a wasteful number, since it uses less digits than its factorization.

12945820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8949 (or 8947 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 12945820 is about 3598.0300165507. The cubic root of 12945820 is about 234.8063592700.

The spelling of 12945820 in words is "twelve million, nine hundred forty-five thousand, eight hundred twenty".