391343223 has 4 divisors (see below), whose sum is σ = 521790968. Its totient is φ = 260895480.

The previous prime is 391343221. The next prime is 391343263. The reversal of 391343223 is 322343193.

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

It is not a de Polignac number, because 391343223 - 2¹ = 391343221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391343221) 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, 65223868 + ... + 65223873.

It is an arithmetic number, because the mean of its divisors is an integer number (130447742).

Almost surely, 2^391343223 is an apocalyptic number.

391343223 is a deficient number, since it is larger than the sum of its proper divisors (130447745).

391343223 is a wasteful number, since it uses less digits than its factorization.

391343223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130447744.

The product of its digits is 11664, while the sum is 30.

The square root of 391343223 is about 19782.3967961418. The cubic root of 391343223 is about 731.4521808978.

Subtracting from 391343223 its sum of digits (30), we obtain a palindrome (391343193).

The spelling of 391343223 in words is "three hundred ninety-one million, three hundred forty-three thousand, two hundred twenty-three".