25487979 has 16 divisors (see below), whose sum is σ = 38686464. Its totient is φ = 14775200.

The previous prime is 25487977. The next prime is 25488031. The reversal of 25487979 is 97978452.

It is not a de Polignac number, because 25487979 - 2¹ = 25487977 is a prime.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (25487971) 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 15 ways as a sum of consecutive naturals, for example, 16032 + ... + 17549.

It is an arithmetic number, because the mean of its divisors is an integer number (2417904).

Almost surely, 2^25487979 is an apocalyptic number.

25487979 is a deficient number, since it is larger than the sum of its proper divisors (13198485).

25487979 is a wasteful number, since it uses less digits than its factorization.

25487979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33618.

The product of its digits is 1270080, while the sum is 51.

The square root of 25487979 is about 5048.5620725113. The cubic root of 25487979 is about 294.2920070673.

The spelling of 25487979 in words is "twenty-five million, four hundred eighty-seven thousand, nine hundred seventy-nine".