251828 has 12 divisors (see below), whose sum is σ = 444612. Its totient is φ = 124800.

The previous prime is 251809. The next prime is 251831. The reversal of 251828 is 828152.

It can be written as a sum of positive squares in 2 ways, for example, as 183184 + 68644 = 428^2 + 262^2 .

It is a junction number, because it is equal to n+sod(n) for n = 251797 and 251806.

It is a congruent number.

It is an unprimeable number.

251828 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 3 ways as a sum of consecutive naturals, for example, 428 + ... + 828.

It is an arithmetic number, because the mean of its divisors is an integer number (37051).

2²⁵¹⁸²⁸ is an apocalyptic number.

It is an amenable number.

251828 is a deficient number, since it is larger than the sum of its proper divisors (192784).

251828 is a wasteful number, since it uses less digits than its factorization.

251828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562 (or 560 counting only the distinct ones).

The product of its digits is 1280, while the sum is 26.

The square root of 251828 is about 501.8246705773. The cubic root of 251828 is about 63.1492221523.

The spelling of 251828 in words is "two hundred fifty-one thousand, eight hundred twenty-eight".