321442409 has 16 divisors (see below), whose sum is σ = 353289600. Its totient is φ = 291105024.

The previous prime is 321442393. The next prime is 321442427. The reversal of 321442409 is 904244123.

It is a cyclic number.

It is not a de Polignac number, because 321442409 - 2⁴ = 321442393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is not an unprimeable number, because it can be changed into a prime (321442439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170132 + ... + 172010.

It is an arithmetic number, because the mean of its divisors is an integer number (22080600).

Almost surely, 2^321442409 is an apocalyptic number.

It is an amenable number.

321442409 is a deficient number, since it is larger than the sum of its proper divisors (31847191).

321442409 is a wasteful number, since it uses less digits than its factorization.

321442409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2272.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 321442409 is about 17928.8150472919. The cubic root of 321442409 is about 685.0165403504.

It can be divided in two parts, 32 and 1442409, that added together give a palindrome (1442441).

The spelling of 321442409 in words is "three hundred twenty-one million, four hundred forty-two thousand, four hundred nine".