12863621 has 4 divisors (see below), whose sum is σ = 12913932. Its totient is φ = 12813312.

The previous prime is 12863573. The next prime is 12863623. The reversal of 12863621 is 12636821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12602500 + 261121 = 3550^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 12863621 - 2²² = 8669317 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 (12863623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24770 + ... + 25283.

It is an arithmetic number, because the mean of its divisors is an integer number (3228483).

Almost surely, 2^12863621 is an apocalyptic number.

It is an amenable number.

12863621 is a deficient number, since it is larger than the sum of its proper divisors (50311).

12863621 is an equidigital number, since it uses as much as digits as its factorization.

12863621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50310.

The product of its digits is 3456, while the sum is 29.

The square root of 12863621 is about 3586.5890481068. The cubic root of 12863621 is about 234.3083389917.

The spelling of 12863621 in words is "twelve million, eight hundred sixty-three thousand, six hundred twenty-one".