25409279 has 4 divisors (see below), whose sum is σ = 29039184. Its totient is φ = 21779376.

The previous prime is 25409261. The next prime is 25409291. The reversal of 25409279 is 97290452.

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 25409279 - 2¹² = 25405183 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 (25409239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1814942 + ... + 1814955.

It is an arithmetic number, because the mean of its divisors is an integer number (7259796).

Almost surely, 2^25409279 is an apocalyptic number.

25409279 is a deficient number, since it is larger than the sum of its proper divisors (3629905).

25409279 is an equidigital number, since it uses as much as digits as its factorization.

25409279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3629904.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 25409279 is about 5040.7617479901. The cubic root of 25409279 is about 293.9887966792.

The spelling of 25409279 in words is "twenty-five million, four hundred nine thousand, two hundred seventy-nine".