25139537 has 4 divisors (see below), whose sum is σ = 25306176. Its totient is φ = 24972900.

The previous prime is 25139531. The next prime is 25139557. The reversal of 25139537 is 73593152.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25139537 - 2⁸ = 25139281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25139497 and 25139506.

It is not an unprimeable number, because it can be changed into a prime (25139531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83093 + ... + 83394.

It is an arithmetic number, because the mean of its divisors is an integer number (6326544).

Almost surely, 2^25139537 is an apocalyptic number.

It is an amenable number.

25139537 is a deficient number, since it is larger than the sum of its proper divisors (166639).

25139537 is a wasteful number, since it uses less digits than its factorization.

25139537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166638.

The product of its digits is 28350, while the sum is 35.

The square root of 25139537 is about 5013.9342835741. The cubic root of 25139537 is about 292.9447763691.

The spelling of 25139537 in words is "twenty-five million, one hundred thirty-nine thousand, five hundred thirty-seven".