13942639 has 2 divisors, whose sum is σ = 13942640. Its totient is φ = 13942638.

The previous prime is 13942619. The next prime is 13942661. The reversal of 13942639 is 93624931.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13942639 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13942598 and 13942607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13942609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6971319 + 6971320.

It is an arithmetic number, because the mean of its divisors is an integer number (6971320).

Almost surely, 2^13942639 is an apocalyptic number.

13942639 is a deficient number, since it is larger than the sum of its proper divisors (1).

13942639 is an equidigital number, since it uses as much as digits as its factorization.

13942639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 37.

The square root of 13942639 is about 3733.9843331219. The cubic root of 13942639 is about 240.6846135314.

It can be divided in two parts, 139 and 42639, that added together give a triangular number (42778 = T₂₉₂).

The spelling of 13942639 in words is "thirteen million, nine hundred forty-two thousand, six hundred thirty-nine".