13699639 has 2 divisors, whose sum is σ = 13699640. Its totient is φ = 13699638.

The previous prime is 13699619. The next prime is 13699649. The reversal of 13699639 is 93699631.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13699639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13699619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6849819 + 6849820.

It is an arithmetic number, because the mean of its divisors is an integer number (6849820).

Almost surely, 2^13699639 is an apocalyptic number.

13699639 is a deficient number, since it is larger than the sum of its proper divisors (1).

13699639 is an equidigital number, since it uses as much as digits as its factorization.

13699639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 236196, while the sum is 46.

The square root of 13699639 is about 3701.3023383669. The cubic root of 13699639 is about 239.2781493455.

The spelling of 13699639 in words is "thirteen million, six hundred ninety-nine thousand, six hundred thirty-nine".