321389965 has 16 divisors (see below), whose sum is σ = 416688048. Its totient is φ = 236560896.

The previous prime is 321389953. The next prime is 321389983. The reversal of 321389965 is 569983123.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 73925604 + 247464361 = 8598^2 + 15731^2 .

It is not a de Polignac number, because 321389965 - 2⁷ = 321389837 is a prime.

It is a Duffinian number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 12447 + ... + 28243.

It is an arithmetic number, because the mean of its divisors is an integer number (26043003).

Almost surely, 2^321389965 is an apocalyptic number.

It is an amenable number.

321389965 is a deficient number, since it is larger than the sum of its proper divisors (95298083).

321389965 is a wasteful number, since it uses less digits than its factorization.

321389965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16128.

The product of its digits is 349920, while the sum is 46.

The square root of 321389965 is about 17927.3524258324. The cubic root of 321389965 is about 684.9792843647.

It can be divided in two parts, 321 and 389965, that added together give a triangular number (390286 = T₈₈₃).

The spelling of 321389965 in words is "three hundred twenty-one million, three hundred eighty-nine thousand, nine hundred sixty-five".