253435989 has 4 divisors (see below), whose sum is σ = 337914656. Its totient is φ = 168957324.

The previous prime is 253435979. The next prime is 253435999. The reversal of 253435989 is 989534352.

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 an interprime number because it is at equal distance from previous prime (253435979) and next prime (253435999).

It is not a de Polignac number, because 253435989 - 2⁵ = 253435957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253435909) 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, 42239329 + ... + 42239334.

It is an arithmetic number, because the mean of its divisors is an integer number (84478664).

Almost surely, 2^253435989 is an apocalyptic number.

It is an amenable number.

253435989 is a deficient number, since it is larger than the sum of its proper divisors (84478667).

253435989 is an equidigital number, since it uses as much as digits as its factorization.

253435989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84478666.

The product of its digits is 1166400, while the sum is 48.

The square root of 253435989 is about 15919.6730179988. The cubic root of 253435989 is about 632.8334529858.

The spelling of 253435989 in words is "two hundred fifty-three million, four hundred thirty-five thousand, nine hundred eighty-nine".