251398864 has 40 divisors (see below), whose sum is σ = 500467968. Its totient is φ = 122279040.

The previous prime is 251398853. The next prime is 251398867. The reversal of 251398864 is 468893152.

251398864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251398867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135189 + ... + 137035.

Almost surely, 2^251398864 is an apocalyptic number.

It is an amenable number.

251398864 is a deficient number, since it is larger than the sum of its proper divisors (249069104).

251398864 is a wasteful number, since it uses less digits than its factorization.

251398864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083 (or 2077 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 251398864 is about 15855.5625570334. The cubic root of 251398864 is about 631.1333123660.

The spelling of 251398864 in words is "two hundred fifty-one million, three hundred ninety-eight thousand, eight hundred sixty-four".