13604639 has 2 divisors, whose sum is σ = 13604640. Its totient is φ = 13604638.

The previous prime is 13604611. The next prime is 13604653. The reversal of 13604639 is 93640631.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13604639 - 2¹⁶ = 13539103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13604609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6802319 + 6802320.

It is an arithmetic number, because the mean of its divisors is an integer number (6802320).

Almost surely, 2^13604639 is an apocalyptic number.

13604639 is a deficient number, since it is larger than the sum of its proper divisors (1).

13604639 is an equidigital number, since it uses as much as digits as its factorization.

13604639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 13604639 is about 3688.4466920372. The cubic root of 13604639 is about 238.7237753420.

The spelling of 13604639 in words is "thirteen million, six hundred four thousand, six hundred thirty-nine".