912820 has 12 divisors (see below), whose sum is σ = 1916964. Its totient is φ = 365120.

The previous prime is 912809. The next prime is 912823. The reversal of 912820 is 28219.

It can be written as a sum of positive squares in 2 ways, for example, as 376996 + 535824 = 614^2 + 732^2 .

It is a super-3 number, since 3×912820³ = 2281795375433304000, which contains 333 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 912791 and 912800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (912823) by changing a digit.

912820 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 22801 + ... + 22840.

It is an arithmetic number, because the mean of its divisors is an integer number (159747).

2⁹¹²⁸²⁰ is an apocalyptic number.

It is an amenable number.

912820 is an abundant number, since it is smaller than the sum of its proper divisors (1004144).

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

912820 is a wasteful number, since it uses less digits than its factorization.

912820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45650 (or 45648 counting only the distinct ones).

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

The square root of 912820 is about 955.4161397004. The cubic root of 912820 is about 97.0052075002.

The spelling of 912820 in words is "nine hundred twelve thousand, eight hundred twenty".