253940717 has 4 divisors (see below), whose sum is σ = 254387580. Its totient is φ = 253493856.

The previous prime is 253940707. The next prime is 253940737. The reversal of 253940717 is 717049352.

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 148693636 + 105247081 = 12194^2 + 10259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253940717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253940707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222578 + ... + 223715.

It is an arithmetic number, because the mean of its divisors is an integer number (63596895).

Almost surely, 2^253940717 is an apocalyptic number.

It is an amenable number.

253940717 is a deficient number, since it is larger than the sum of its proper divisors (446863).

253940717 is an equidigital number, since it uses as much as digits as its factorization.

253940717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446862.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 253940717 is about 15935.5174688493. The cubic root of 253940717 is about 633.2532788626.

The spelling of 253940717 in words is "two hundred fifty-three million, nine hundred forty thousand, seven hundred seventeen".