321818 has 16 divisors (see below), whose sum is σ = 559104. Its totient is φ = 136080.

The previous prime is 321817. The next prime is 321821. The reversal of 321818 is 818123.

It is an alternating number because its digits alternate between odd and even.

321818 is a modest number, since divided by 1818 gives 32 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 321793 and 321802.

It is not an unprimeable number, because it can be changed into a prime (321817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1688 + ... + 1868.

It is an arithmetic number, because the mean of its divisors is an integer number (34944).

2³²¹⁸¹⁸ is an apocalyptic number.

321818 is a deficient number, since it is larger than the sum of its proper divisors (237286).

321818 is a wasteful number, since it uses less digits than its factorization.

321818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317.

The product of its digits is 384, while the sum is 23.

The square root of 321818 is about 567.2900492693. The cubic root of 321818 is about 68.5283240176.

The spelling of 321818 in words is "three hundred twenty-one thousand, eight hundred eighteen".