923921 has 4 divisors (see below), whose sum is σ = 926772. Its totient is φ = 921072.

The previous prime is 923917. The next prime is 923929. The reversal of 923921 is 129329.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129329 = 23 ⋅5623.

It can be written as a sum of positive squares in 2 ways, for example, as 483025 + 440896 = 695^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 923921 - 2² = 923917 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 923921.

It is not an unprimeable number, because it can be changed into a prime (923929) 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, 866 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (231693).

2⁹²³⁹²¹ is an apocalyptic number.

It is an amenable number.

923921 is a deficient number, since it is larger than the sum of its proper divisors (2851).

923921 is a wasteful number, since it uses less digits than its factorization.

923921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2850.

The product of its digits is 972, while the sum is 26.

The square root of 923921 is about 961.2080940150. The cubic root of 923921 is about 97.3968578354.

The spelling of 923921 in words is "nine hundred twenty-three thousand, nine hundred twenty-one".