251228238 has 16 divisors (see below), whose sum is σ = 514712016. Its totient is φ = 81700160.

The previous prime is 251228191. The next prime is 251228239. The reversal of 251228238 is 832822152.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 251228199 and 251228208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251228239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510381 + ... + 510872.

It is an arithmetic number, because the mean of its divisors is an integer number (32169501).

Almost surely, 2^251228238 is an apocalyptic number.

251228238 is an abundant number, since it is smaller than the sum of its proper divisors (263483778).

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

251228238 is a wasteful number, since it uses less digits than its factorization.

251228238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021299.

The product of its digits is 15360, while the sum is 33.

The square root of 251228238 is about 15850.1810084302. The cubic root of 251228238 is about 630.9904953264.

The spelling of 251228238 in words is "two hundred fifty-one million, two hundred twenty-eight thousand, two hundred thirty-eight".