321388423 has 4 divisors (see below), whose sum is σ = 321946000. Its totient is φ = 320830848.

The previous prime is 321388421. The next prime is 321388427. The reversal of 321388423 is 324883123.

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 321388423 - 2¹ = 321388421 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 (321388421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277923 + ... + 279076.

It is an arithmetic number, because the mean of its divisors is an integer number (80486500).

Almost surely, 2^321388423 is an apocalyptic number.

321388423 is a deficient number, since it is larger than the sum of its proper divisors (557577).

321388423 is an equidigital number, since it uses as much as digits as its factorization.

321388423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557576.

The product of its digits is 27648, while the sum is 34.

The square root of 321388423 is about 17927.3094188726. The cubic root of 321388423 is about 684.9781888734.

The spelling of 321388423 in words is "three hundred twenty-one million, three hundred eighty-eight thousand, four hundred twenty-three".