13439725 has 18 divisors (see below), whose sum is σ = 18051486. Its totient is φ = 9921600.

The previous prime is 13439689. The next prime is 13439737. The reversal of 13439725 is 52793431.

It can be written as a sum of positive squares in 9 ways, for example, as 11485321 + 1954404 = 3389^2 + 1398^2 .

It is not a de Polignac number, because 13439725 - 2¹³ = 13431533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 2635 + ... + 5815.

Almost surely, 2^13439725 is an apocalyptic number.

It is an amenable number.

13439725 is a deficient number, since it is larger than the sum of its proper divisors (4611761).

13439725 is a wasteful number, since it uses less digits than its factorization.

13439725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217 (or 3199 counting only the distinct ones).

The product of its digits is 22680, while the sum is 34.

The square root of 13439725 is about 3666.0230495729. The cubic root of 13439725 is about 237.7552564938.

The spelling of 13439725 in words is "thirteen million, four hundred thirty-nine thousand, seven hundred twenty-five".