321309690 has 64 divisors (see below), whose sum is σ = 879330816. Its totient is φ = 74437632.

The previous prime is 321309679. The next prime is 321309697. The reversal of 321309690 is 96903123.

It is a super-2 number, since 2×321309690² = 206479833775792200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (321309697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17602 + ... + 30861.

It is an arithmetic number, because the mean of its divisors is an integer number (13739544).

Almost surely, 2^321309690 is an apocalyptic number.

321309690 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

321309690 is an abundant number, since it is smaller than the sum of its proper divisors (558021126).

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

321309690 is a wasteful number, since it uses less digits than its factorization.

321309690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48503.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 321309690 is about 17925.1133887627. The cubic root of 321309690 is about 684.9222495091.

The spelling of 321309690 in words is "three hundred twenty-one million, three hundred nine thousand, six hundred ninety".