253745705 has 4 divisors (see below), whose sum is σ = 304494852. Its totient is φ = 202996560.

The previous prime is 253745677. The next prime is 253745707. The reversal of 253745705 is 507547352.

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 88134544 + 165611161 = 9388^2 + 12869^2 .

It is not a de Polignac number, because 253745705 - 2⁶ = 253745641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253745707) 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, 25374566 + ... + 25374575.

It is an arithmetic number, because the mean of its divisors is an integer number (76123713).

Almost surely, 2^253745705 is an apocalyptic number.

It is an amenable number.

253745705 is a deficient number, since it is larger than the sum of its proper divisors (50749147).

253745705 is an equidigital number, since it uses as much as digits as its factorization.

253745705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50749146.

The product of its (nonzero) digits is 147000, while the sum is 38.

The square root of 253745705 is about 15929.3975090083. The cubic root of 253745705 is about 633.0911365393.

The spelling of 253745705 in words is "two hundred fifty-three million, seven hundred forty-five thousand, seven hundred five".