25632399 has 16 divisors (see below), whose sum is σ = 37032800. Its totient is φ = 15769728.

The previous prime is 25632361. The next prime is 25632407. The reversal of 25632399 is 99323652.

It is not a de Polignac number, because 25632399 - 2⁹ = 25631887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25632359) 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, 4647 + ... + 8535.

It is an arithmetic number, because the mean of its divisors is an integer number (2314550).

Almost surely, 2^25632399 is an apocalyptic number.

25632399 is a deficient number, since it is larger than the sum of its proper divisors (11400401).

25632399 is an equidigital number, since it uses as much as digits as its factorization.

25632399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3931 (or 3905 counting only the distinct ones).

The product of its digits is 87480, while the sum is 39.

The square root of 25632399 is about 5062.8449512107. The cubic root of 25632399 is about 294.8467997026.

The spelling of 25632399 in words is "twenty-five million, six hundred thirty-two thousand, three hundred ninety-nine".