251947340 has 12 divisors (see below), whose sum is σ = 529089456. Its totient is φ = 100778928.

The previous prime is 251947301. The next prime is 251947351. The reversal of 251947340 is 43749152.

It is a self number, because there is not a number n which added to its sum of digits gives 251947340.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6298664 + ... + 6298703.

It is an arithmetic number, because the mean of its divisors is an integer number (44090788).

Almost surely, 2^251947340 is an apocalyptic number.

251947340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251947340 is an abundant number, since it is smaller than the sum of its proper divisors (277142116).

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

251947340 is a wasteful number, since it uses less digits than its factorization.

251947340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12597376 (or 12597374 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 251947340 is about 15872.8491456323. The cubic root of 251947340 is about 631.5919594127.

The spelling of 251947340 in words is "two hundred fifty-one million, nine hundred forty-seven thousand, three hundred forty".