253642638 has 32 divisors (see below), whose sum is σ = 520515072. Its totient is φ = 82353600.

The previous prime is 253642621. The next prime is 253642639. The reversal of 253642638 is 836246352.

It is a happy number.

253642638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 253642596 and 253642605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253642639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110058 + ... + 112338.

It is an arithmetic number, because the mean of its divisors is an integer number (16266096).

Almost surely, 2^253642638 is an apocalyptic number.

253642638 is an abundant number, since it is smaller than the sum of its proper divisors (266872434).

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

253642638 is a wasteful number, since it uses less digits than its factorization.

253642638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760.

The product of its digits is 207360, while the sum is 39.

The square root of 253642638 is about 15926.1620612124. The cubic root of 253642638 is about 633.0054081382.

The spelling of 253642638 in words is "two hundred fifty-three million, six hundred forty-two thousand, six hundred thirty-eight".