13439739 has 8 divisors (see below), whose sum is σ = 17958400. Its totient is φ = 8940456.

The previous prime is 13439737. The next prime is 13439743. The reversal of 13439739 is 93793431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13439739 - 2¹ = 13439737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13439697 and 13439706.

It is not an unprimeable number, because it can be changed into a prime (13439737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3139 + ... + 6060.

It is an arithmetic number, because the mean of its divisors is an integer number (2244800).

Almost surely, 2^13439739 is an apocalyptic number.

13439739 is a deficient number, since it is larger than the sum of its proper divisors (4518661).

13439739 is an equidigital number, since it uses as much as digits as its factorization.

13439739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9689.

The product of its digits is 61236, while the sum is 39.

The square root of 13439739 is about 3666.0249589985. The cubic root of 13439739 is about 237.7553390493.

The spelling of 13439739 in words is "thirteen million, four hundred thirty-nine thousand, seven hundred thirty-nine".