252746405 has 4 divisors (see below), whose sum is σ = 303295692. Its totient is φ = 202197120.

The previous prime is 252746399. The next prime is 252746407. The reversal of 252746405 is 504647252.

It is a Cunningham number, because it is equal to 15898²+1.

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 90973444 + 161772961 = 9538^2 + 12719^2 .

It is not a de Polignac number, because 252746405 - 2²⁰ = 251697829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252746407) 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, 25274636 + ... + 25274645.

It is an arithmetic number, because the mean of its divisors is an integer number (75823923).

Almost surely, 2^252746405 is an apocalyptic number.

It is an amenable number.

252746405 is a deficient number, since it is larger than the sum of its proper divisors (50549287).

252746405 is an equidigital number, since it uses as much as digits as its factorization.

252746405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50549286.

The product of its (nonzero) digits is 67200, while the sum is 35.

The square root of 252746405 is about 15898.0000314505. Note that the first 4 decimals coincide. The cubic root of 252746405 is about 632.2589644354.

The spelling of 252746405 in words is "two hundred fifty-two million, seven hundred forty-six thousand, four hundred five".