25139457 has 16 divisors (see below), whose sum is σ = 42564480. Its totient is φ = 14365296.

The previous prime is 25139453. The next prime is 25139479. The reversal of 25139457 is 75493152.

25139457 is a `hidden beast` number, since 2 + 513 + 94 + 57 = 666.

It is not a de Polignac number, because 25139457 - 2² = 25139453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25139453) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 66318 + ... + 66695.

It is an arithmetic number, because the mean of its divisors is an integer number (2660280).

Almost surely, 2^25139457 is an apocalyptic number.

25139457 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

25139457 is a deficient number, since it is larger than the sum of its proper divisors (17425023).

25139457 is a wasteful number, since it uses less digits than its factorization.

25139457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133029 (or 133023 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 25139457 is about 5013.9263058007. The cubic root of 25139457 is about 292.9444656287.

The spelling of 25139457 in words is "twenty-five million, one hundred thirty-nine thousand, four hundred fifty-seven".