13620657 has 4 divisors (see below), whose sum is σ = 18160880. Its totient is φ = 9080436.

The previous prime is 13620641. The next prime is 13620667. The reversal of 13620657 is 75602631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13620657 - 2⁴ = 13620641 is a prime.

It is a super-2 number, since 2×13620657² = 371044594223298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13620667) 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, 2270107 + ... + 2270112.

It is an arithmetic number, because the mean of its divisors is an integer number (4540220).

Almost surely, 2^13620657 is an apocalyptic number.

It is an amenable number.

13620657 is a deficient number, since it is larger than the sum of its proper divisors (4540223).

13620657 is an equidigital number, since it uses as much as digits as its factorization.

13620657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4540222.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 13620657 is about 3690.6174280193. The cubic root of 13620657 is about 238.8174291239.

The spelling of 13620657 in words is "thirteen million, six hundred twenty thousand, six hundred fifty-seven".