253439965 has 4 divisors (see below), whose sum is σ = 304127964. Its totient is φ = 202751968.

The previous prime is 253439957. The next prime is 253440041. The reversal of 253439965 is 569934352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48692484 + 204747481 = 6978^2 + 14309^2 .

It is a cyclic number.

It is not a de Polignac number, because 253439965 - 2³ = 253439957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25343992 + ... + 25344001.

It is an arithmetic number, because the mean of its divisors is an integer number (76031991).

Almost surely, 2^253439965 is an apocalyptic number.

It is an amenable number.

253439965 is a deficient number, since it is larger than the sum of its proper divisors (50687999).

253439965 is an equidigital number, since it uses as much as digits as its factorization.

253439965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50687998.

The product of its digits is 874800, while the sum is 46.

The square root of 253439965 is about 15919.7978944458. The cubic root of 253439965 is about 632.8367623457.

It can be divided in two parts, 2534399 and 65, that added together give a square (2534464 = 1592²).

The spelling of 253439965 in words is "two hundred fifty-three million, four hundred thirty-nine thousand, nine hundred sixty-five".