253565405 has 8 divisors (see below), whose sum is σ = 304775352. Its totient is φ = 202521088.

The previous prime is 253565383. The next prime is 253565419. The reversal of 253565405 is 504565352.

It can be written as a sum of positive squares in 4 ways, for example, as 26822041 + 226743364 = 5179^2 + 15058^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 253565405 - 2¹² = 253561309 is a prime.

It is a super-2 number, since 2×253565405² = 128590829225628050, which contains 22 as substring.

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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38012 + ... + 44181.

It is an arithmetic number, because the mean of its divisors is an integer number (38096919).

Almost surely, 2^253565405 is an apocalyptic number.

It is an amenable number.

253565405 is a deficient number, since it is larger than the sum of its proper divisors (51209947).

253565405 is an equidigital number, since it uses as much as digits as its factorization.

253565405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82815.

The product of its (nonzero) digits is 90000, while the sum is 35.

The square root of 253565405 is about 15923.7371555800. The cubic root of 253565405 is about 632.9411525513.

The spelling of 253565405 in words is "two hundred fifty-three million, five hundred sixty-five thousand, four hundred five".