816990 has 32 divisors (see below), whose sum is σ = 1986336. Its totient is φ = 215040.

The previous prime is 816971. The next prime is 817013. The reversal of 816990 is 99618.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3270 + ... + 3510.

It is an arithmetic number, because the mean of its divisors is an integer number (62073).

2⁸¹⁶⁹⁹⁰ is an apocalyptic number.

816990 is an abundant number, since it is smaller than the sum of its proper divisors (1169346).

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

816990 is a wasteful number, since it uses less digits than its factorization.

816990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 816990 is about 903.8749913567. The cubic root of 816990 is about 93.4843501884.

The spelling of 816990 in words is "eight hundred sixteen thousand, nine hundred ninety".