253440669 has 4 divisors (see below), whose sum is σ = 337920896. Its totient is φ = 168960444.

The previous prime is 253440653. The next prime is 253440679. The reversal of 253440669 is 966044352.

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 253440669 - 2⁴ = 253440653 is a prime.

It is a super-2 number, since 2×253440669² = 128464345406335122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253440679) 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, 42240109 + ... + 42240114.

It is an arithmetic number, because the mean of its divisors is an integer number (84480224).

Almost surely, 2^253440669 is an apocalyptic number.

It is an amenable number.

253440669 is a deficient number, since it is larger than the sum of its proper divisors (84480227).

253440669 is an equidigital number, since it uses as much as digits as its factorization.

253440669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84480226.

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 253440669 is about 15919.8200052639. The cubic root of 253440669 is about 632.8373483052.

The spelling of 253440669 in words is "two hundred fifty-three million, four hundred forty thousand, six hundred sixty-nine".