253440847 has 4 divisors (see below), whose sum is σ = 276480936. Its totient is φ = 230400760.

The previous prime is 253440827. The next prime is 253440851. The reversal of 253440847 is 748044352.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253440847 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 (253440827) 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, 11520028 + ... + 11520049.

It is an arithmetic number, because the mean of its divisors is an integer number (69120234).

Almost surely, 2^253440847 is an apocalyptic number.

253440847 is a deficient number, since it is larger than the sum of its proper divisors (23040089).

253440847 is a wasteful number, since it uses less digits than its factorization.

253440847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23040088.

The product of its (nonzero) digits is 107520, while the sum is 37.

The square root of 253440847 is about 15919.8255957784. The cubic root of 253440847 is about 632.8374964595.

The spelling of 253440847 in words is "two hundred fifty-three million, four hundred forty thousand, eight hundred forty-seven".