812920 has 16 divisors (see below), whose sum is σ = 1829160. Its totient is φ = 325152.

The previous prime is 812869. The next prime is 812921. The reversal of 812920 is 29218.

It is a junction number, because it is equal to n+sod(n) for n = 812891 and 812900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812921) by changing a digit.

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, 10122 + ... + 10201.

2⁸¹²⁹²⁰ is an apocalyptic number.

It is an amenable number.

812920 is an abundant number, since it is smaller than the sum of its proper divisors (1016240).

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

812920 is a wasteful number, since it uses less digits than its factorization.

812920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20334 (or 20330 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 812920 is about 901.6207628488. The cubic root of 812920 is about 93.3288546604.

The spelling of 812920 in words is "eight hundred twelve thousand, nine hundred twenty".