423979 has 4 divisors (see below), whose sum is σ = 425520. Its totient is φ = 422440.

The previous prime is 423977. The next prime is 423989. The reversal of 423979 is 979324.

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 423979 - 2¹ = 423977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423977) 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, 232 + ... + 949.

It is an arithmetic number, because the mean of its divisors is an integer number (106380).

2⁴²³⁹⁷⁹ is an apocalyptic number.

423979 is a deficient number, since it is larger than the sum of its proper divisors (1541).

423979 is a wasteful number, since it uses less digits than its factorization.

423979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540.

The product of its digits is 13608, while the sum is 34.

The square root of 423979 is about 651.1366983975. The cubic root of 423979 is about 75.1244747809.

The spelling of 423979 in words is "four hundred twenty-three thousand, nine hundred seventy-nine".