321693440 has 36 divisors (see below), whose sum is σ = 770559384. Its totient is φ = 128676864.

The previous prime is 321693439. The next prime is 321693473. The reversal of 321693440 is 44396123.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 321693397 and 321693406.

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 3 ways as a sum of consecutive naturals, for example, 124382 + ... + 126941.

Almost surely, 2^321693440 is an apocalyptic number.

It is an amenable number.

321693440 is an abundant number, since it is smaller than the sum of its proper divisors (448865944).

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

321693440 is an equidigital number, since it uses as much as digits as its factorization.

321693440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251344 (or 251330 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 321693440 is about 17935.8144504229. The cubic root of 321693440 is about 685.1948155639.

The spelling of 321693440 in words is "three hundred twenty-one million, six hundred ninety-three thousand, four hundred forty".