25991479 has 8 divisors (see below), whose sum is σ = 26778752. Its totient is φ = 25212600.

The previous prime is 25991461. The next prime is 25991509. The reversal of 25991479 is 97419952.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25991479 - 2¹⁷ = 25860407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25991179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4492 + ... + 8494.

It is an arithmetic number, because the mean of its divisors is an integer number (3347344).

Almost surely, 2^25991479 is an apocalyptic number.

25991479 is a deficient number, since it is larger than the sum of its proper divisors (787273).

25991479 is a wasteful number, since it uses less digits than its factorization.

25991479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4197.

The product of its digits is 204120, while the sum is 46.

The square root of 25991479 is about 5098.1838923287. The cubic root of 25991479 is about 296.2172399341.

The spelling of 25991479 in words is "twenty-five million, nine hundred ninety-one thousand, four hundred seventy-nine".