253440740 has 36 divisors (see below), whose sum is σ = 619121916. Its totient is φ = 86893632.

The previous prime is 253440731. The next prime is 253440757. The reversal of 253440740 is 47044352.

It can be written as a sum of positive squares in 2 ways, for example, as 156300004 + 97140736 = 12502^2 + 9856^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128327 + ... + 130286.

It is an arithmetic number, because the mean of its divisors is an integer number (17197831).

Almost surely, 2^253440740 is an apocalyptic number.

253440740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

253440740 is an abundant number, since it is smaller than the sum of its proper divisors (365681176).

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

253440740 is a wasteful number, since it uses less digits than its factorization.

253440740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258636 (or 258627 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 29.

The square root of 253440740 is about 15919.8222351884. The cubic root of 253440740 is about 632.8374074005.

The spelling of 253440740 in words is "two hundred fifty-three million, four hundred forty thousand, seven hundred forty".