423999 has 6 divisors (see below), whose sum is σ = 612456. Its totient is φ = 282660.

The previous prime is 423991. The next prime is 424001. The reversal of 423999 is 999324.

It is not a de Polignac number, because 423999 - 2³ = 423991 is a prime.

423999 is a modest number, since divided by 999 gives 423 as remainder.

423999 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23547 + ... + 23564.

It is an arithmetic number, because the mean of its divisors is an integer number (102076).

2⁴²³⁹⁹⁹ is an apocalyptic number.

423999 is a deficient number, since it is larger than the sum of its proper divisors (188457).

423999 is a wasteful number, since it uses less digits than its factorization.

423999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47117 (or 47114 counting only the distinct ones).

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

The square root of 423999 is about 651.1520559746. The cubic root of 423999 is about 75.1256560233.

The spelling of 423999 in words is "four hundred twenty-three thousand, nine hundred ninety-nine".