25256399 has 4 divisors (see below), whose sum is σ = 28864464. Its totient is φ = 21648336.

The previous prime is 25256383. The next prime is 25256431. The reversal of 25256399 is 99365252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25256399 - 2⁴ = 25256383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25256359) 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, 1804022 + ... + 1804035.

It is an arithmetic number, because the mean of its divisors is an integer number (7216116).

Almost surely, 2^25256399 is an apocalyptic number.

25256399 is a deficient number, since it is larger than the sum of its proper divisors (3608065).

25256399 is an equidigital number, since it uses as much as digits as its factorization.

25256399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608064.

The product of its digits is 145800, while the sum is 41.

The square root of 25256399 is about 5025.5744945230. The cubic root of 25256399 is about 293.3979961039.

The spelling of 25256399 in words is "twenty-five million, two hundred fifty-six thousand, three hundred ninety-nine".