251988342 has 16 divisors (see below), whose sum is σ = 515697600. Its totient is φ = 82042632.

The previous prime is 251988329. The next prime is 251988343. The reversal of 251988342 is 243889152.

It is a junction number, because it is equal to n+sod(n) for n = 251988294 and 251988303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251988343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488092 + ... + 488607.

It is an arithmetic number, because the mean of its divisors is an integer number (32231100).

Almost surely, 2^251988342 is an apocalyptic number.

251988342 is an abundant number, since it is smaller than the sum of its proper divisors (263709258).

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

251988342 is a wasteful number, since it uses less digits than its factorization.

251988342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976747.

The product of its digits is 138240, while the sum is 42.

The square root of 251988342 is about 15874.1406696552. The cubic root of 251988342 is about 631.6262193879.

The spelling of 251988342 in words is "two hundred fifty-one million, nine hundred eighty-eight thousand, three hundred forty-two".