25440489 has 24 divisors (see below), whose sum is σ = 37889280. Its totient is φ = 16440768.

The previous prime is 25440479. The next prime is 25440521. The reversal of 25440489 is 98404452.

It is not a de Polignac number, because 25440489 - 2¹⁵ = 25407721 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25440419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57732 + ... + 58170.

It is an arithmetic number, because the mean of its divisors is an integer number (1578720).

Almost surely, 2^25440489 is an apocalyptic number.

It is an amenable number.

25440489 is a deficient number, since it is larger than the sum of its proper divisors (12448791).

25440489 is a wasteful number, since it uses less digits than its factorization.

25440489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 25440489 is about 5043.8565602126. The cubic root of 25440489 is about 294.1091154051.

The spelling of 25440489 in words is "twenty-five million, four hundred forty thousand, four hundred eighty-nine".