921828 has 12 divisors (see below), whose sum is σ = 2150960. Its totient is φ = 307272.

The previous prime is 921821. The next prime is 921839. The reversal of 921828 is 828129.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 921795 and 921804.

It is not an unprimeable number, because it can be changed into a prime (921821) by changing a digit.

921828 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, 38398 + ... + 38421.

2⁹²¹⁸²⁸ is an apocalyptic number.

It is an amenable number.

921828 is an abundant number, since it is smaller than the sum of its proper divisors (1229132).

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

921828 is a wasteful number, since it uses less digits than its factorization.

921828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76826 (or 76824 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 921828 is about 960.1187426563. The cubic root of 921828 is about 97.3232563951.

The spelling of 921828 in words is "nine hundred twenty-one thousand, eight hundred twenty-eight".