25818397 has 32 divisors (see below), whose sum is σ = 31933440. Its totient is φ = 20592000.

The previous prime is 25818389. The next prime is 25818407. The reversal of 25818397 is 79381852.

It is not a de Polignac number, because 25818397 - 2³ = 25818389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25818307) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197022 + ... + 197152.

It is an arithmetic number, because the mean of its divisors is an integer number (997920).

Almost surely, 2^25818397 is an apocalyptic number.

It is an amenable number.

25818397 is a deficient number, since it is larger than the sum of its proper divisors (6115043).

25818397 is a wasteful number, since it uses less digits than its factorization.

25818397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225.

The product of its digits is 120960, while the sum is 43.

The square root of 25818397 is about 5081.1806698837. The cubic root of 25818397 is about 295.5582534464.

The spelling of 25818397 in words is "twenty-five million, eight hundred eighteen thousand, three hundred ninety-seven".