816995943 has 8 divisors (see below), whose sum is σ = 1210364400. Its totient is φ = 544663944.

The previous prime is 816995941. The next prime is 816995987. The reversal of 816995943 is 349599618.

It is not a de Polignac number, because 816995943 - 2¹ = 816995941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 816995943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816995941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15129528 + ... + 15129581.

It is an arithmetic number, because the mean of its divisors is an integer number (151295550).

Almost surely, 2^816995943 is an apocalyptic number.

816995943 is a deficient number, since it is larger than the sum of its proper divisors (393368457).

816995943 is a wasteful number, since it uses less digits than its factorization.

816995943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30259118 (or 30259112 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 816995943 is about 28583.1408875932. The cubic root of 816995943 is about 934.8457686447.

The spelling of 816995943 in words is "eight hundred sixteen million, nine hundred ninety-five thousand, nine hundred forty-three".