25855399 has 4 divisors (see below), whose sum is σ = 26279320. Its totient is φ = 25431480.

The previous prime is 25855397. The next prime is 25855411. The reversal of 25855399 is 99355852.

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 25855399 - 2¹ = 25855397 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 (25855391) 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, 211869 + ... + 211990.

It is an arithmetic number, because the mean of its divisors is an integer number (6569830).

Almost surely, 2^25855399 is an apocalyptic number.

25855399 is a deficient number, since it is larger than the sum of its proper divisors (423921).

25855399 is an equidigital number, since it uses as much as digits as its factorization.

25855399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423920.

The product of its digits is 486000, while the sum is 46.

The square root of 25855399 is about 5084.8204491408. The cubic root of 25855399 is about 295.6993805423.

The spelling of 25855399 in words is "twenty-five million, eight hundred fifty-five thousand, three hundred ninety-nine".