13604621 has 4 divisors (see below), whose sum is σ = 13711872. Its totient is φ = 13497372.

The previous prime is 13604611. The next prime is 13604639. The reversal of 13604621 is 12640631.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12640631 = 2719 ⋅4649.

It is a cyclic number.

It is not a de Polignac number, because 13604621 - 2¹⁸ = 13342477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13604611) 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, 53435 + ... + 53688.

It is an arithmetic number, because the mean of its divisors is an integer number (3427968).

Almost surely, 2^13604621 is an apocalyptic number.

It is an amenable number.

13604621 is a deficient number, since it is larger than the sum of its proper divisors (107251).

13604621 is a wasteful number, since it uses less digits than its factorization.

13604621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107250.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 13604621 is about 3688.4442519848. Note that the first 3 decimals coincide. The cubic root of 13604621 is about 238.7236700586.

The spelling of 13604621 in words is "thirteen million, six hundred four thousand, six hundred twenty-one".