25439317 has 4 divisors (see below), whose sum is σ = 25701676. Its totient is φ = 25176960.

The previous prime is 25439303. The next prime is 25439321. The reversal of 25439317 is 71393452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15256836 + 10182481 = 3906^2 + 3191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25439317 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 (25439717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131034 + ... + 131227.

It is an arithmetic number, because the mean of its divisors is an integer number (6425419).

Almost surely, 2^25439317 is an apocalyptic number.

It is an amenable number.

25439317 is a deficient number, since it is larger than the sum of its proper divisors (262359).

25439317 is an equidigital number, since it uses as much as digits as its factorization.

25439317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262358.

The product of its digits is 22680, while the sum is 34.

The square root of 25439317 is about 5043.7403779338. The cubic root of 25439317 is about 294.1045989670.

The spelling of 25439317 in words is "twenty-five million, four hundred thirty-nine thousand, three hundred seventeen".