12623821 has 12 divisors (see below), whose sum is σ = 14759580. Its totient is φ = 10765440.

The previous prime is 12623813. The next prime is 12623837. The reversal of 12623821 is 12832621.

It can be written as a sum of positive squares in 2 ways, for example, as 7761796 + 4862025 = 2786^2 + 2205^2 .

It is not a de Polignac number, because 12623821 - 2³ = 12623813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12623321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11275 + ... + 12343.

It is an arithmetic number, because the mean of its divisors is an integer number (1229965).

Almost surely, 2^12623821 is an apocalyptic number.

It is an amenable number.

12623821 is a deficient number, since it is larger than the sum of its proper divisors (2135759).

12623821 is a wasteful number, since it uses less digits than its factorization.

12623821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324 (or 1317 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 12623821 is about 3553.0016887134. The cubic root of 12623821 is about 232.8432268290.

The spelling of 12623821 in words is "twelve million, six hundred twenty-three thousand, eight hundred twenty-one".