253878917 has 4 divisors (see below), whose sum is σ = 255817056. Its totient is φ = 251940780.

The previous prime is 253878839. The next prime is 253878949. The reversal of 253878917 is 719878352.

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 a cyclic number.

It is not a de Polignac number, because 253878917 - 2¹⁰ = 253877893 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 (253878617) 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, 968873 + ... + 969134.

It is an arithmetic number, because the mean of its divisors is an integer number (63954264).

Almost surely, 2^253878917 is an apocalyptic number.

It is an amenable number.

253878917 is a deficient number, since it is larger than the sum of its proper divisors (1938139).

253878917 is a wasteful number, since it uses less digits than its factorization.

253878917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938138.

The product of its digits is 846720, while the sum is 50.

The square root of 253878917 is about 15933.5782861227. The cubic root of 253878917 is about 633.2019043683.

The spelling of 253878917 in words is "two hundred fifty-three million, eight hundred seventy-eight thousand, nine hundred seventeen".