25666398 has 12 divisors (see below), whose sum is σ = 55610568. Its totient is φ = 8555460.

The previous prime is 25666391. The next prime is 25666409. The reversal of 25666398 is 89366652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25666391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 712938 + ... + 712973.

It is an arithmetic number, because the mean of its divisors is an integer number (4634214).

Almost surely, 2^25666398 is an apocalyptic number.

25666398 is an abundant number, since it is smaller than the sum of its proper divisors (29944170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25666398 is a wasteful number, since it uses less digits than its factorization.

25666398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425919 (or 1425916 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 25666398 is about 5066.2015356675. The cubic root of 25666398 is about 294.9771044186.

The spelling of 25666398 in words is "twenty-five million, six hundred sixty-six thousand, three hundred ninety-eight".