25138539 has 16 divisors (see below), whose sum is σ = 39203200. Its totient is φ = 15876648.

The previous prime is 25138493. The next prime is 25138549. The reversal of 25138539 is 93583152.

It is not a de Polignac number, because 25138539 - 2¹¹ = 25136491 is a prime.

It is a super-2 number, since 2×25138539² = 1263892286109042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25138549) 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 in 15 ways as a sum of consecutive naturals, for example, 23989 + ... + 25014.

It is an arithmetic number, because the mean of its divisors is an integer number (2450200).

Almost surely, 2^25138539 is an apocalyptic number.

25138539 is a deficient number, since it is larger than the sum of its proper divisors (14064661).

25138539 is a wasteful number, since it uses less digits than its factorization.

25138539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49031 (or 49025 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 25138539 is about 5013.8347599417. The cubic root of 25138539 is about 292.9408998358.

The spelling of 25138539 in words is "twenty-five million, one hundred thirty-eight thousand, five hundred thirty-nine".