13406639 has 4 divisors (see below), whose sum is σ = 13539480. Its totient is φ = 13273800.

The previous prime is 13406599. The next prime is 13406651. The reversal of 13406639 is 93660431.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13406639 - 2¹⁶ = 13341103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13406339) 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, 66269 + ... + 66470.

It is an arithmetic number, because the mean of its divisors is an integer number (3384870).

Almost surely, 2^13406639 is an apocalyptic number.

13406639 is a deficient number, since it is larger than the sum of its proper divisors (132841).

13406639 is a wasteful number, since it uses less digits than its factorization.

13406639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132840.

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

The square root of 13406639 is about 3661.5077495480. The cubic root of 13406639 is about 237.5599937083.

The spelling of 13406639 in words is "thirteen million, four hundred six thousand, six hundred thirty-nine".