13628921 has 2 divisors, whose sum is σ = 13628922. Its totient is φ = 13628920.

The previous prime is 13628899. The next prime is 13628929. The reversal of 13628921 is 12982631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7182400 + 6446521 = 2680^2 + 2539^2 .

It is a cyclic number.

It is not a de Polignac number, because 13628921 - 2¹⁴ = 13612537 is a prime.

It is not a weakly prime, because it can be changed into another prime (13628929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6814460 + 6814461.

It is an arithmetic number, because the mean of its divisors is an integer number (6814461).

Almost surely, 2^13628921 is an apocalyptic number.

It is an amenable number.

13628921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13628921 is an equidigital number, since it uses as much as digits as its factorization.

13628921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 13628921 is about 3691.7368541108. The cubic root of 13628921 is about 238.8657182342.

The spelling of 13628921 in words is "thirteen million, six hundred twenty-eight thousand, nine hundred twenty-one".