25642239 has 48 divisors (see below), whose sum is σ = 43600896. Its totient is φ = 13305600.

The previous prime is 25642231. The next prime is 25642249. The reversal of 25642239 is 93224652.

It is not a de Polignac number, because 25642239 - 2³ = 25642231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25642231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77304 + ... + 77634.

It is an arithmetic number, because the mean of its divisors is an integer number (908352).

Almost surely, 2^25642239 is an apocalyptic number.

25642239 is a deficient number, since it is larger than the sum of its proper divisors (17958657).

25642239 is a wasteful number, since it uses less digits than its factorization.

25642239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 389 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 25642239 is about 5063.8166436000. The cubic root of 25642239 is about 294.8845243719.

The spelling of 25642239 in words is "twenty-five million, six hundred forty-two thousand, two hundred thirty-nine".