321490 has 16 divisors (see below), whose sum is σ = 623448. Its totient is φ = 118656.

The previous prime is 321469. The next prime is 321509. The reversal of 321490 is 94123.

It is a Cunningham number, because it is equal to 567²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 239121 + 82369 = 489^2 + 287^2 .

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

It is an unprimeable number.

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, 1107 + ... + 1366.

2³²¹⁴⁹⁰ is an apocalyptic number.

321490 is a deficient number, since it is larger than the sum of its proper divisors (301958).

321490 is a wasteful number, since it uses less digits than its factorization.

321490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2493.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 321490 is about 567.0008818335. Note that the first 3 decimals coincide. The cubic root of 321490 is about 68.5050345279.

The spelling of 321490 in words is "three hundred twenty-one thousand, four hundred ninety".