251922 has 24 divisors (see below), whose sum is σ = 555408. Its totient is φ = 76120.

The previous prime is 251917. The next prime is 251939. The reversal of 251922 is 229152.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

251922 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 553 + ... + 899.

It is an arithmetic number, because the mean of its divisors is an integer number (23142).

2²⁵¹⁹²² is an apocalyptic number.

251922 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 251922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277704).

251922 is an abundant number, since it is smaller than the sum of its proper divisors (303486).

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

251922 is a wasteful number, since it uses less digits than its factorization.

251922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 363 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 251922 is about 501.9183200482. The cubic root of 251922 is about 63.1570784251.

The spelling of 251922 in words is "two hundred fifty-one thousand, nine hundred twenty-two".