253440849 has 4 divisors (see below), whose sum is σ = 337921136. Its totient is φ = 168960564.

The previous prime is 253440827. The next prime is 253440851. The reversal of 253440849 is 948044352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 253440849 - 2¹⁶ = 253375313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253440809) 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, 42240139 + ... + 42240144.

It is an arithmetic number, because the mean of its divisors is an integer number (84480284).

Almost surely, 2^253440849 is an apocalyptic number.

It is an amenable number.

253440849 is a deficient number, since it is larger than the sum of its proper divisors (84480287).

253440849 is an equidigital number, since it uses as much as digits as its factorization.

253440849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84480286.

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 253440849 is about 15919.8256585931. The cubic root of 253440849 is about 632.8374981242.

The spelling of 253440849 in words is "two hundred fifty-three million, four hundred forty thousand, eight hundred forty-nine".