251937842 has 16 divisors (see below), whose sum is σ = 409714200. Its totient is φ = 115496832.

The previous prime is 251937839. The next prime is 251937859. The reversal of 251937842 is 248739152.

It can be written as a sum of positive squares in 4 ways, for example, as 185531641 + 66406201 = 13621^2 + 8149^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 251937842.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28643 + ... + 36390.

Almost surely, 2^251937842 is an apocalyptic number.

251937842 is a deficient number, since it is larger than the sum of its proper divisors (157776358).

251937842 is a wasteful number, since it uses less digits than its factorization.

251937842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65197.

The product of its digits is 120960, while the sum is 41.

The square root of 251937842 is about 15872.5499526699. The cubic root of 251937842 is about 631.5840226539.

The spelling of 251937842 in words is "two hundred fifty-one million, nine hundred thirty-seven thousand, eight hundred forty-two".