25864431 has 4 divisors (see below), whose sum is σ = 34485912. Its totient is φ = 17242952.

The previous prime is 25864417. The next prime is 25864441. The reversal of 25864431 is 13446852.

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 25864431 - 2⁷ = 25864303 is a prime.

It is a super-2 number, since 2×25864431² = 1337937581907522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25864392 and 25864401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25864441) 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, 4310736 + ... + 4310741.

It is an arithmetic number, because the mean of its divisors is an integer number (8621478).

Almost surely, 2^25864431 is an apocalyptic number.

25864431 is a deficient number, since it is larger than the sum of its proper divisors (8621481).

25864431 is an equidigital number, since it uses as much as digits as its factorization.

25864431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8621480.

The product of its digits is 23040, while the sum is 33.

The square root of 25864431 is about 5085.7085052134. The cubic root of 25864431 is about 295.7338085016.

The spelling of 25864431 in words is "twenty-five million, eight hundred sixty-four thousand, four hundred thirty-one".