25390889 has 4 divisors (see below), whose sum is σ = 25410756. Its totient is φ = 25371024.

The previous prime is 25390853. The next prime is 25390901. The reversal of 25390889 is 98809352.

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 19669225 + 5721664 = 4435^2 + 2392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25390889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25390819) 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 3 ways as a sum of consecutive naturals, for example, 7874 + ... + 10619.

It is an arithmetic number, because the mean of its divisors is an integer number (6352689).

Almost surely, 2^25390889 is an apocalyptic number.

It is an amenable number.

25390889 is a deficient number, since it is larger than the sum of its proper divisors (19867).

25390889 is a wasteful number, since it uses less digits than its factorization.

25390889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19866.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 25390889 is about 5038.9372887544. The cubic root of 25390889 is about 293.9178546321.

The spelling of 25390889 in words is "twenty-five million, three hundred ninety thousand, eight hundred eighty-nine".