816980 has 12 divisors (see below), whose sum is σ = 1715700. Its totient is φ = 326784.

The previous prime is 816971. The next prime is 817013. The reversal of 816980 is 89618.

It can be written as a sum of positive squares in 2 ways, for example, as 425104 + 391876 = 652^2 + 626^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20405 + ... + 20444.

It is an arithmetic number, because the mean of its divisors is an integer number (142975).

2⁸¹⁶⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

816980 is an abundant number, since it is smaller than the sum of its proper divisors (898720).

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

816980 is a wasteful number, since it uses less digits than its factorization.

816980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40858 (or 40856 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 816980 is about 903.8694596013. The cubic root of 816980 is about 93.4839687691.

The spelling of 816980 in words is "eight hundred sixteen thousand, nine hundred eighty".