25439869 has 12 divisors (see below), whose sum is σ = 31870524. Its totient is φ = 20127744.

The previous prime is 25439851. The next prime is 25439881. The reversal of 25439869 is 96893452.

It can be written as a sum of positive squares in 2 ways, for example, as 12744900 + 12694969 = 3570^2 + 3563^2 .

It is not a de Polignac number, because 25439869 - 2⁷ = 25439741 is a prime.

It is a super-2 number, since 2×25439869² = 1294373869474322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25439569) 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 11 ways as a sum of consecutive naturals, for example, 19332 + ... + 20605.

It is an arithmetic number, because the mean of its divisors is an integer number (2655877).

Almost surely, 2^25439869 is an apocalyptic number.

It is an amenable number.

25439869 is a deficient number, since it is larger than the sum of its proper divisors (6430655).

25439869 is a wasteful number, since it uses less digits than its factorization.

25439869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39964 (or 39957 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 25439869 is about 5043.7950989310. The cubic root of 25439869 is about 294.1067261804.

The spelling of 25439869 in words is "twenty-five million, four hundred thirty-nine thousand, eight hundred sixty-nine".