921983 has 4 divisors (see below), whose sum is σ = 923928. Its totient is φ = 920040.

The previous prime is 921959. The next prime is 921989. The reversal of 921983 is 389129.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 921983 - 2⁶ = 921919 is a prime.

It is a Duffinian number.

Its product of digits (3888) is a multiple of the sum of its prime divisors (1944).

It is a plaindrome in base 14.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260 + ... + 1382.

It is an arithmetic number, because the mean of its divisors is an integer number (230982).

2⁹²¹⁹⁸³ is an apocalyptic number.

921983 is a deficient number, since it is larger than the sum of its proper divisors (1945).

921983 is a wasteful number, since it uses less digits than its factorization.

921983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944.

The product of its digits is 3888, while the sum is 32.

The square root of 921983 is about 960.1994584460. The cubic root of 921983 is about 97.3287108687.

The spelling of 921983 in words is "nine hundred twenty-one thousand, nine hundred eighty-three".