13439939 has 2 divisors, whose sum is σ = 13439940. Its totient is φ = 13439938.

The previous prime is 13439929. The next prime is 13440001. The reversal of 13439939 is 93993431.

13439939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13439939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13439896 and 13439905.

It is not a weakly prime, because it can be changed into another prime (13439929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6719969 + 6719970.

It is an arithmetic number, because the mean of its divisors is an integer number (6719970).

Almost surely, 2^13439939 is an apocalyptic number.

13439939 is a deficient number, since it is larger than the sum of its proper divisors (1).

13439939 is an equidigital number, since it uses as much as digits as its factorization.

13439939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 41.

The square root of 13439939 is about 3666.0522363982. The cubic root of 13439939 is about 237.7565184084.

The spelling of 13439939 in words is "thirteen million, four hundred thirty-nine thousand, nine hundred thirty-nine".