251898742 has 8 divisors (see below), whose sum is σ = 378389232. Its totient is φ = 125769000.

The previous prime is 251898739. The next prime is 251898767. The reversal of 251898742 is 247898152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 251898692 and 251898701.

It is a congruent number.

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, 88434 + ... + 91237.

It is an arithmetic number, because the mean of its divisors is an integer number (47298654).

Almost surely, 2^251898742 is an apocalyptic number.

251898742 is a deficient number, since it is larger than the sum of its proper divisors (126490490).

251898742 is a wasteful number, since it uses less digits than its factorization.

251898742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180374.

The product of its digits is 322560, while the sum is 46.

The square root of 251898742 is about 15871.3182187240. The cubic root of 251898742 is about 631.5513476460.

The spelling of 251898742 in words is "two hundred fifty-one million, eight hundred ninety-eight thousand, seven hundred forty-two".