25636397 has 4 divisors (see below), whose sum is σ = 25651200. Its totient is φ = 25621596.

The previous prime is 25636381. The next prime is 25636427. The reversal of 25636397 is 79363652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25636397 - 2⁴ = 25636381 is a prime.

It is a super-2 number, since 2×25636397² = 1314449702283218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25636097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4397 + ... + 8402.

It is an arithmetic number, because the mean of its divisors is an integer number (6412800).

Almost surely, 2^25636397 is an apocalyptic number.

It is an amenable number.

25636397 is a deficient number, since it is larger than the sum of its proper divisors (14803).

25636397 is a wasteful number, since it uses less digits than its factorization.

25636397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14802.

The product of its digits is 204120, while the sum is 41.

The square root of 25636397 is about 5063.2397731097. The cubic root of 25636397 is about 294.8621284307.

The spelling of 25636397 in words is "twenty-five million, six hundred thirty-six thousand, three hundred ninety-seven".