391223 has 4 divisors (see below), whose sum is σ = 447120. Its totient is φ = 335328.

The previous prime is 391219. The next prime is 391231. The reversal of 391223 is 322193.

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

It is not a de Polignac number, because 391223 - 2² = 391219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 391195 and 391204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391273) 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, 27938 + ... + 27951.

It is an arithmetic number, because the mean of its divisors is an integer number (111780).

2³⁹¹²²³ is an apocalyptic number.

391223 is a deficient number, since it is larger than the sum of its proper divisors (55897).

391223 is an equidigital number, since it uses as much as digits as its factorization.

391223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55896.

The product of its digits is 324, while the sum is 20.

The square root of 391223 is about 625.4782170468. The cubic root of 391223 is about 73.1377271052.

The spelling of 391223 in words is "three hundred ninety-one thousand, two hundred twenty-three".