25974989 has 2 divisors, whose sum is σ = 25974990. Its totient is φ = 25974988.

The previous prime is 25974961. The next prime is 25975003. The reversal of 25974989 is 98947952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22250089 + 3724900 = 4717^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 25974989 - 2²⁰ = 24926413 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25974989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25974089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12987494 + 12987495.

It is an arithmetic number, because the mean of its divisors is an integer number (12987495).

Almost surely, 2^25974989 is an apocalyptic number.

It is an amenable number.

25974989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25974989 is an equidigital number, since it uses as much as digits as its factorization.

25974989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 53.

The square root of 25974989 is about 5096.5663931710. The cubic root of 25974989 is about 296.1545827885.

The spelling of 25974989 in words is "twenty-five million, nine hundred seventy-four thousand, nine hundred eighty-nine".