25399812 has 12 divisors (see below), whose sum is σ = 59266256. Its totient is φ = 8466600.

The previous prime is 25399811. The next prime is 25399813. The reversal of 25399812 is 21899352.

It is an interprime number because it is at equal distance from previous prime (25399811) and next prime (25399813).

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (25399811) 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, 1058314 + ... + 1058337.

Almost surely, 2^25399812 is an apocalyptic number.

It is an amenable number.

25399812 is an abundant number, since it is smaller than the sum of its proper divisors (33866444).

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

25399812 is a wasteful number, since it uses less digits than its factorization.

25399812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116658 (or 2116656 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 25399812 is about 5039.8226159261. The cubic root of 25399812 is about 293.9522806534.

The spelling of 25399812 in words is "twenty-five million, three hundred ninety-nine thousand, eight hundred twelve".