253940917 has 4 divisors (see below), whose sum is σ = 268878636. Its totient is φ = 239003200.

The previous prime is 253940903. The next prime is 253940923. The reversal of 253940917 is 719049352.

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 90459121 + 163481796 = 9511^2 + 12786^2 .

It is a cyclic number.

It is not a de Polignac number, because 253940917 - 2⁷ = 253940789 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 253940917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253940317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7468834 + ... + 7468867.

It is an arithmetic number, because the mean of its divisors is an integer number (67219659).

Almost surely, 2^253940917 is an apocalyptic number.

It is an amenable number.

253940917 is a deficient number, since it is larger than the sum of its proper divisors (14937719).

253940917 is a wasteful number, since it uses less digits than its factorization.

253940917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14937718.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 253940917 is about 15935.5237441384. The cubic root of 253940917 is about 633.2534451096.

The spelling of 253940917 in words is "two hundred fifty-three million, nine hundred forty thousand, nine hundred seventeen".