253665442 has 8 divisors (see below), whose sum is σ = 389778732. Its totient is φ = 123739200.

The previous prime is 253665431. The next prime is 253665443. The reversal of 253665442 is 244566352.

It can be written as a sum of positive squares in 2 ways, for example, as 253159921 + 505521 = 15911^2 + 711^2 .

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

It is not an unprimeable number, because it can be changed into a prime (253665443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1546659 + ... + 1546822.

Almost surely, 2^253665442 is an apocalyptic number.

253665442 is a deficient number, since it is larger than the sum of its proper divisors (136113290).

253665442 is a wasteful number, since it uses less digits than its factorization.

253665442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3093524.

The product of its digits is 172800, while the sum is 37.

The square root of 253665442 is about 15926.8779740412. The cubic root of 253665442 is about 633.0243779019.

The spelling of 253665442 in words is "two hundred fifty-three million, six hundred sixty-five thousand, four hundred forty-two".