321433040 has 40 divisors (see below), whose sum is σ = 749550240. Its totient is φ = 128191616.

The previous prime is 321433039. The next prime is 321433069. The reversal of 321433040 is 40334123.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21971 + ... + 33549.

It is an arithmetic number, because the mean of its divisors is an integer number (18738756).

Almost surely, 2^321433040 is an apocalyptic number.

It is an amenable number.

321433040 is an abundant number, since it is smaller than the sum of its proper divisors (428117200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321433040 is a wasteful number, since it uses less digits than its factorization.

321433040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11939 (or 11933 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 321433040 is about 17928.5537620858. The cubic root of 321433040 is about 685.0098849516.

Adding to 321433040 its reverse (40334123), we get a palindrome (361767163).

The spelling of 321433040 in words is "three hundred twenty-one million, four hundred thirty-three thousand, forty".