25135623 has 16 divisors (see below), whose sum is σ = 37324000. Its totient is φ = 16718400.

The previous prime is 25135609. The next prime is 25135631. The reversal of 25135623 is 32653152.

25135623 is a `hidden beast` number, since 2 + 5 + 1 + 35 + 623 = 666.

It is not a de Polignac number, because 25135623 - 2⁶ = 25135559 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25135603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15453 + ... + 17001.

It is an arithmetic number, because the mean of its divisors is an integer number (2332750).

Almost surely, 2^25135623 is an apocalyptic number.

25135623 is a deficient number, since it is larger than the sum of its proper divisors (12188377).

25135623 is a wasteful number, since it uses less digits than its factorization.

25135623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159 (or 2153 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 25135623 is about 5013.5439561252. The cubic root of 25135623 is about 292.9295726236.

Adding to 25135623 its reverse (32653152), we get a palindrome (57788775).

The spelling of 25135623 in words is "twenty-five million, one hundred thirty-five thousand, six hundred twenty-three".