25320399 has 16 divisors (see below), whose sum is σ = 36472800. Its totient is φ = 15532416.

The previous prime is 25320391. The next prime is 25320403. The reversal of 25320399 is 99302352.

It is not a de Polignac number, because 25320399 - 2³ = 25320391 is a prime.

It is a super-2 number, since 2×25320399² = 1282245211038402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25320391) 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, 14337 + ... + 16005.

It is an arithmetic number, because the mean of its divisors is an integer number (2279550).

Almost surely, 2^25320399 is an apocalyptic number.

25320399 is a deficient number, since it is larger than the sum of its proper divisors (11152401).

25320399 is a wasteful number, since it uses less digits than its factorization.

25320399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074.

The product of its (nonzero) digits is 14580, while the sum is 33.

The square root of 25320399 is about 5031.9378970731. The cubic root of 25320399 is about 293.6456116787.

The spelling of 25320399 in words is "twenty-five million, three hundred twenty thousand, three hundred ninety-nine".