25390439 has 4 divisors (see below), whose sum is σ = 26009760. Its totient is φ = 24771120.

The previous prime is 25390433. The next prime is 25390471. The reversal of 25390439 is 93409352.

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 25390439 - 2¹⁶ = 25324903 is a prime.

It is a super-2 number, since 2×25390439² = 1289348785225442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25390399 and 25390408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25390433) 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, 309599 + ... + 309680.

It is an arithmetic number, because the mean of its divisors is an integer number (6502440).

Almost surely, 2^25390439 is an apocalyptic number.

25390439 is a deficient number, since it is larger than the sum of its proper divisors (619321).

25390439 is an equidigital number, since it uses as much as digits as its factorization.

25390439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619320.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 25390439 is about 5038.8926362843. The cubic root of 25390439 is about 293.9161182636.

The spelling of 25390439 in words is "twenty-five million, three hundred ninety thousand, four hundred thirty-nine".