391233 has 4 divisors (see below), whose sum is σ = 521648. Its totient is φ = 260820.

The previous prime is 391231. The next prime is 391247. The reversal of 391233 is 332193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 332193 = 3 ⋅110731.

It is not a de Polignac number, because 391233 - 2¹ = 391231 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391231) 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, 65203 + ... + 65208.

It is an arithmetic number, because the mean of its divisors is an integer number (130412).

2³⁹¹²³³ is an apocalyptic number.

It is an amenable number.

391233 is a deficient number, since it is larger than the sum of its proper divisors (130415).

391233 is a wasteful number, since it uses less digits than its factorization.

391233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130414.

The product of its digits is 486, while the sum is 21.

The square root of 391233 is about 625.4862108792. The cubic root of 391233 is about 73.1383502545.

The spelling of 391233 in words is "three hundred ninety-one thousand, two hundred thirty-three".