517977894 has 64 divisors (see below), whose sum is σ = 1247892480. Its totient is φ = 140131200.

The previous prime is 517977893. The next prime is 517977899. The reversal of 517977894 is 498779715.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517977893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94912 + ... + 100220.

It is an arithmetic number, because the mean of its divisors is an integer number (19498320).

Almost surely, 2^517977894 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 517977894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (623946240).

517977894 is an abundant number, since it is smaller than the sum of its proper divisors (729914586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

517977894 is a wasteful number, since it uses less digits than its factorization.

517977894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5445.

The product of its digits is 4445280, while the sum is 57.

The square root of 517977894 is about 22759.1277073617. The cubic root of 517977894 is about 803.1014472020.

The spelling of 517977894 in words is "five hundred seventeen million, nine hundred seventy-seven thousand, eight hundred ninety-four".