13457621 has 4 divisors (see below), whose sum is σ = 13471500. Its totient is φ = 13443744.

The previous prime is 13457611. The next prime is 13457629. The reversal of 13457621 is 12675431.

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 11458225 + 1999396 = 3385^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 13457621 - 2¹⁸ = 13195477 is a prime.

It is a super-2 number, since 2×13457621² = 362215125959282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13457629) 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 3 ways as a sum of consecutive naturals, for example, 5366 + ... + 7463.

It is an arithmetic number, because the mean of its divisors is an integer number (3367875).

Almost surely, 2^13457621 is an apocalyptic number.

It is an amenable number.

13457621 is a deficient number, since it is larger than the sum of its proper divisors (13879).

13457621 is a wasteful number, since it uses less digits than its factorization.

13457621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13878.

The product of its digits is 5040, while the sum is 29.

The square root of 13457621 is about 3668.4630296624. The cubic root of 13457621 is about 237.8607393294.

The spelling of 13457621 in words is "thirteen million, four hundred fifty-seven thousand, six hundred twenty-one".