921980 has 12 divisors (see below), whose sum is σ = 1936200. Its totient is φ = 368784.

The previous prime is 921959. The next prime is 921989. The reversal of 921980 is 89129.

921980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 921980.

It is not an unprimeable number, because it can be changed into a prime (921989) by changing a digit.

921980 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23030 + ... + 23069.

It is an arithmetic number, because the mean of its divisors is an integer number (161350).

2⁹²¹⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

921980 is an abundant number, since it is smaller than the sum of its proper divisors (1014220).

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

921980 is a wasteful number, since it uses less digits than its factorization.

921980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46108 (or 46106 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 921980 is about 960.1978962693. The cubic root of 921980 is about 97.3286053040.

The spelling of 921980 in words is "nine hundred twenty-one thousand, nine hundred eighty".