816939 has 16 divisors (see below), whose sum is σ = 1228800. Its totient is φ = 536328.

The previous prime is 816929. The next prime is 816941. The reversal of 816939 is 939618.

It is not a de Polignac number, because 816939 - 2⁷ = 816811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1942 + ... + 2324.

It is an arithmetic number, because the mean of its divisors is an integer number (76800).

2⁸¹⁶⁹³⁹ is an apocalyptic number.

816939 is a deficient number, since it is larger than the sum of its proper divisors (411861).

816939 is a wasteful number, since it uses less digits than its factorization.

816939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 465 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 816939 is about 903.8467790505. The cubic root of 816939 is about 93.4824049174.

The spelling of 816939 in words is "eight hundred sixteen thousand, nine hundred thirty-nine".