13004639 has 2 divisors, whose sum is σ = 13004640. Its totient is φ = 13004638.

The previous prime is 13004599. The next prime is 13004647. The reversal of 13004639 is 93640031.

It is a strong prime.

It is an emirp because it is prime and its reverse (93640031) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13004639 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13004539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6502319 + 6502320.

It is an arithmetic number, because the mean of its divisors is an integer number (6502320).

Almost surely, 2^13004639 is an apocalyptic number.

13004639 is a deficient number, since it is larger than the sum of its proper divisors (1).

13004639 is an equidigital number, since it uses as much as digits as its factorization.

13004639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 13004639 is about 3606.1945316358. The cubic root of 13004639 is about 235.1614342705.

The spelling of 13004639 in words is "thirteen million, four thousand, six hundred thirty-nine".