253631994 has 64 divisors (see below), whose sum is σ = 659957760. Its totient is φ = 63011520.

The previous prime is 253631953. The next prime is 253632023. The reversal of 253631994 is 499136352.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1309 + ... + 22560.

It is an arithmetic number, because the mean of its divisors is an integer number (10311840).

Almost surely, 2^253631994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 253631994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329978880).

253631994 is an abundant number, since it is smaller than the sum of its proper divisors (406325766).

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

253631994 is a wasteful number, since it uses less digits than its factorization.

253631994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23915.

The product of its digits is 174960, while the sum is 42.

The square root of 253631994 is about 15925.8278905682. The cubic root of 253631994 is about 632.9965534179.

The spelling of 253631994 in words is "two hundred fifty-three million, six hundred thirty-one thousand, nine hundred ninety-four".