251997894 has 24 divisors (see below), whose sum is σ = 547126632. Its totient is φ = 83825280.

The previous prime is 251997883. The next prime is 251997899. The reversal of 251997894 is 498799152.

251997894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 251997894.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251997899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5419 + ... + 23094.

It is an arithmetic number, because the mean of its divisors is an integer number (22796943).

Almost surely, 2^251997894 is an apocalyptic number.

251997894 is an abundant number, since it is smaller than the sum of its proper divisors (295128738).

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

251997894 is a wasteful number, since it uses less digits than its factorization.

251997894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29012 (or 29009 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 251997894 is about 15874.4415334839. The cubic root of 251997894 is about 631.6342002034.

The spelling of 251997894 in words is "two hundred fifty-one million, nine hundred ninety-seven thousand, eight hundred ninety-four".