25979409 has 9 divisors (see below), whose sum is σ = 37547913. Its totient is φ = 17309412.

The previous prime is 25979357. The next prime is 25979423. The reversal of 25979409 is 90497952.

The square root of 25979409 is 5097.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 25979409 - 2¹³ = 25971217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25979449) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14442 + ... + 16140.

Almost surely, 2^25979409 is an apocalyptic number.

25979409 is the 5097-th square number.

25979409 is the 2549-th centered octagonal number.

It is an amenable number.

25979409 is a deficient number, since it is larger than the sum of its proper divisors (11568504).

25979409 is an frugal number, since it uses more digits than its factorization.

25979409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3404 (or 1702 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The cubic root of 25979409 is about 296.1713800881.

The spelling of 25979409 in words is "twenty-five million, nine hundred seventy-nine thousand, four hundred nine".