25479439 has 4 divisors (see below), whose sum is σ = 25531000. Its totient is φ = 25427880.

The previous prime is 25479383. The next prime is 25479449. The reversal of 25479439 is 93497452.

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 25479439 - 2⁹ = 25478927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25479395 and 25479404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25479449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25032 + ... + 26029.

It is an arithmetic number, because the mean of its divisors is an integer number (6382750).

Almost surely, 2^25479439 is an apocalyptic number.

25479439 is a deficient number, since it is larger than the sum of its proper divisors (51561).

25479439 is an equidigital number, since it uses as much as digits as its factorization.

25479439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51560.

The product of its digits is 272160, while the sum is 43.

The square root of 25479439 is about 5047.7162162705. The cubic root of 25479439 is about 294.2591349110.

The spelling of 25479439 in words is "twenty-five million, four hundred seventy-nine thousand, four hundred thirty-nine".