999423 has 12 divisors (see below), whose sum is σ = 1452360. Its totient is φ = 662256.

The previous prime is 999389. The next prime is 999431. The reversal of 999423 is 324999.

It is not a de Polignac number, because 999423 - 2⁶ = 999359 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 2.

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 999423.

It is not an unprimeable number, because it can be changed into a prime (999433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2448 + ... + 2826.

It is an arithmetic number, because the mean of its divisors is an integer number (121030).

2⁹⁹⁹⁴²³ is an apocalyptic number.

999423 is a deficient number, since it is larger than the sum of its proper divisors (452937).

999423 is a wasteful number, since it uses less digits than its factorization.

999423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 675 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 999423 is about 999.7114583719. The cubic root of 999423 is about 99.9807629663.

The spelling of 999423 in words is "nine hundred ninety-nine thousand, four hundred twenty-three".