891923 has 2 divisors, whose sum is σ = 891924. Its totient is φ = 891922.

The previous prime is 891907. The next prime is 891929. The reversal of 891923 is 329198.

891923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891923 - 2⁴ = 891907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 891923.

It is not a weakly prime, because it can be changed into another prime (891929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445961 + 445962.

It is an arithmetic number, because the mean of its divisors is an integer number (445962).

2⁸⁹¹⁹²³ is an apocalyptic number.

891923 is a deficient number, since it is larger than the sum of its proper divisors (1).

891923 is an equidigital number, since it uses as much as digits as its factorization.

891923 is an evil number, because the sum of its binary digits is even.

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

The square root of 891923 is about 944.4167512280. The cubic root of 891923 is about 96.2592457526.

The spelling of 891923 in words is "eight hundred ninety-one thousand, nine hundred twenty-three".