321399366 has 16 divisors (see below), whose sum is σ = 642981888. Its totient is φ = 107102600.

The previous prime is 321399361. The next prime is 321399371. The reversal of 321399366 is 663993123.

It is an interprime number because it is at equal distance from previous prime (321399361) and next prime (321399371).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321399361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27931 + ... + 37721.

It is an arithmetic number, because the mean of its divisors is an integer number (40186368).

Almost surely, 2^321399366 is an apocalyptic number.

321399366 is an abundant number, since it is smaller than the sum of its proper divisors (321582522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321399366 is a wasteful number, since it uses less digits than its factorization.

321399366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15267.

The product of its digits is 157464, while the sum is 42.

The square root of 321399366 is about 17927.6146210253. The cubic root of 321399366 is about 684.9859630917.

The spelling of 321399366 in words is "three hundred twenty-one million, three hundred ninety-nine thousand, three hundred sixty-six".