253721238 has 8 divisors (see below), whose sum is σ = 507442488. Its totient is φ = 84573744.

The previous prime is 253721233. The next prime is 253721249. The reversal of 253721238 is 832127352.

It is a sphenic number, since it is the product of 3 distinct primes.

253721238 is an admirable number.

It is a super-2 number, since 2×253721238² = 128748933224505288, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 253721199 and 253721208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253721233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21143431 + ... + 21143442.

It is an arithmetic number, because the mean of its divisors is an integer number (63430311).

Almost surely, 2^253721238 is an apocalyptic number.

253721238 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

253721238 is a wasteful number, since it uses less digits than its factorization.

253721238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42286878.

The product of its digits is 20160, while the sum is 33.

The square root of 253721238 is about 15928.6295079018. The cubic root of 253721238 is about 633.0707876383.

The spelling of 253721238 in words is "two hundred fifty-three million, seven hundred twenty-one thousand, two hundred thirty-eight".