423994 has 4 divisors (see below), whose sum is σ = 635994. Its totient is φ = 211996.

The previous prime is 423991. The next prime is 424001. The reversal of 423994 is 499324.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 405769 + 18225 = 637^2 + 135^2 .

It is a super-3 number, since 3×423994³ = 228665364233375352, which contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 105997 + ... + 106000.

2⁴²³⁹⁹⁴ is an apocalyptic number.

423994 is a deficient number, since it is larger than the sum of its proper divisors (212000).

423994 is a wasteful number, since it uses less digits than its factorization.

423994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211999.

The product of its digits is 7776, while the sum is 31.

The square root of 423994 is about 651.1482166143. The cubic root of 423994 is about 75.1253607162.

The spelling of 423994 in words is "four hundred twenty-three thousand, nine hundred ninety-four".