25139465 has 16 divisors (see below), whose sum is σ = 33369168. Its totient is φ = 18061056.

The previous prime is 25139453. The next prime is 25139479. The reversal of 25139465 is 56493152.

It can be written as a sum of positive squares in 8 ways, for example, as 1993744 + 23145721 = 1412^2 + 4811^2 .

It is not a de Polignac number, because 25139465 - 2¹⁴ = 25123081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2822 + ... + 7631.

It is an arithmetic number, because the mean of its divisors is an integer number (2085573).

Almost surely, 2^25139465 is an apocalyptic number.

It is an amenable number.

25139465 is a deficient number, since it is larger than the sum of its proper divisors (8229703).

25139465 is a wasteful number, since it uses less digits than its factorization.

25139465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10508.

The product of its digits is 32400, while the sum is 35.

The square root of 25139465 is about 5013.9271035786. The cubic root of 25139465 is about 292.9444967028.

The spelling of 25139465 in words is "twenty-five million, one hundred thirty-nine thousand, four hundred sixty-five".