25139535 has 16 divisors (see below), whose sum is σ = 40401504. Its totient is φ = 13348352.

The previous prime is 25139531. The next prime is 25139557. The reversal of 25139535 is 53593152.

It is a cyclic number.

It is not a de Polignac number, because 25139535 - 2² = 25139531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25139496 and 25139505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25139531) 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, 102 + ... + 7091.

It is an arithmetic number, because the mean of its divisors is an integer number (2525094).

Almost surely, 2^25139535 is an apocalyptic number.

25139535 is a deficient number, since it is larger than the sum of its proper divisors (15261969).

25139535 is a wasteful number, since it uses less digits than its factorization.

25139535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7434.

The product of its digits is 20250, while the sum is 33.

The square root of 25139535 is about 5013.9340841299. The cubic root of 25139535 is about 292.9447686006.

The spelling of 25139535 in words is "twenty-five million, one hundred thirty-nine thousand, five hundred thirty-five".