251796 has 12 divisors (see below), whose sum is σ = 587552. Its totient is φ = 83928.

The previous prime is 251791. The next prime is 251809. The reversal of 251796 is 697152.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251791) by changing a digit.

251796 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10480 + ... + 10503.

2²⁵¹⁷⁹⁶ is an apocalyptic number.

It is an amenable number.

251796 is an abundant number, since it is smaller than the sum of its proper divisors (335756).

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

251796 is a wasteful number, since it uses less digits than its factorization.

251796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20990 (or 20988 counting only the distinct ones).

The product of its digits is 3780, while the sum is 30.

The square root of 251796 is about 501.7927859186. The cubic root of 251796 is about 63.1465472303.

The spelling of 251796 in words is "two hundred fifty-one thousand, seven hundred ninety-six".