917971928894 has 4 divisors (see below), whose sum is σ = 1376957893344. Its totient is φ = 458985964446.

The previous prime is 917971928891. The next prime is 917971928941. The reversal of 917971928894 is 498829179719.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (917971928891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 229492982222 + ... + 229492982225.

It is an arithmetic number, because the mean of its divisors is an integer number (344239473336).

Almost surely, 2^917971928894 is an apocalyptic number.

917971928894 is a deficient number, since it is larger than the sum of its proper divisors (458985964450).

917971928894 is a wasteful number, since it uses less digits than its factorization.

917971928894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458985964449.

The product of its digits is 164602368, while the sum is 74.

The spelling of 917971928894 in words is "nine hundred seventeen billion, nine hundred seventy-one million, nine hundred twenty-eight thousand, eight hundred ninety-four".