251438994 has 48 divisors (see below), whose sum is σ = 551640960. Its totient is φ = 82766880.

The previous prime is 251438983. The next prime is 251439029. The reversal of 251438994 is 499834152.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 907584 + ... + 907860.

It is an arithmetic number, because the mean of its divisors is an integer number (11492520).

Almost surely, 2^251438994 is an apocalyptic number.

251438994 is an abundant number, since it is smaller than the sum of its proper divisors (300201966).

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

251438994 is a wasteful number, since it uses less digits than its factorization.

251438994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 732 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 251438994 is about 15856.8279930130. The cubic root of 251438994 is about 631.1668925128.

The spelling of 251438994 in words is "two hundred fifty-one million, four hundred thirty-eight thousand, nine hundred ninety-four".