25242138 has 16 divisors (see below), whose sum is σ = 56093760. Its totient is φ = 8414028.

The previous prime is 25242137. The next prime is 25242163. The reversal of 25242138 is 83124252.

25242138 is a `hidden beast` number, since 2 + 524 + 2 + 138 = 666.

It is a super-2 number, since 2×25242138² = 1274331061622088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25242131) 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, 233670 + ... + 233777.

It is an arithmetic number, because the mean of its divisors is an integer number (3505860).

Almost surely, 2^25242138 is an apocalyptic number.

25242138 is an abundant number, since it is smaller than the sum of its proper divisors (30851622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25242138 is a wasteful number, since it uses less digits than its factorization.

25242138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467458 (or 467452 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 25242138 is about 5024.1554514167. The cubic root of 25242138 is about 293.3427634136.

The spelling of 25242138 in words is "twenty-five million, two hundred forty-two thousand, one hundred thirty-eight".