321669 has 12 divisors (see below), whose sum is σ = 470496. Its totient is φ = 211752.

The previous prime is 321661. The next prime is 321679. The reversal of 321669 is 966123.

It is a happy number.

It is not a de Polignac number, because 321669 - 2³ = 321661 is a prime.

It is a super-2 number, since 2×321669² = 206941891122, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3⁷ + 2¹⁵ + 6³ + 1 + 6⁷ + 9⁴ .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 321669.

It is not an unprimeable number, because it can be changed into a prime (321661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 754 + ... + 1100.

It is an arithmetic number, because the mean of its divisors is an integer number (39208).

2³²¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

321669 is a deficient number, since it is larger than the sum of its proper divisors (148827).

321669 is a wasteful number, since it uses less digits than its factorization.

321669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 453 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 321669 is about 567.1587079469. The cubic root of 321669 is about 68.5177463034.

It can be divided in two parts, 321 and 669, that added together give a triangular number (990 = T₄₄).

The spelling of 321669 in words is "three hundred twenty-one thousand, six hundred sixty-nine".