25239899 has 4 divisors (see below), whose sum is σ = 25326336. Its totient is φ = 25153464.

The previous prime is 25239881. The next prime is 25239937. The reversal of 25239899 is 99893252.

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

It is not a de Polignac number, because 25239899 - 2¹⁶ = 25174363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25239829) 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, 42779 + ... + 43364.

It is an arithmetic number, because the mean of its divisors is an integer number (6331584).

Almost surely, 2^25239899 is an apocalyptic number.

25239899 is a deficient number, since it is larger than the sum of its proper divisors (86437).

25239899 is an equidigital number, since it uses as much as digits as its factorization.

25239899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86436.

The product of its digits is 349920, while the sum is 47.

The square root of 25239899 is about 5023.9326229558. The cubic root of 25239899 is about 293.3340899028.

The spelling of 25239899 in words is "twenty-five million, two hundred thirty-nine thousand, eight hundred ninety-nine".