423391 has 4 divisors (see below), whose sum is σ = 434872. Its totient is φ = 411912.

The previous prime is 423389. The next prime is 423403. The reversal of 423391 is 193324.

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 423391 - 2¹ = 423389 is a prime.

It is an Ulam number.

It is a Duffinian number.

423391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423341) 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, 5685 + ... + 5758.

It is an arithmetic number, because the mean of its divisors is an integer number (108718).

2⁴²³³⁹¹ is an apocalyptic number.

423391 is a deficient number, since it is larger than the sum of its proper divisors (11481).

423391 is a wasteful number, since it uses less digits than its factorization.

423391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11480.

The product of its digits is 648, while the sum is 22.

The square root of 423391 is about 650.6850236482. The cubic root of 423391 is about 75.0897296421.

The spelling of 423391 in words is "four hundred twenty-three thousand, three hundred ninety-one".