321475440 has 640 divisors, whose sum is σ = 1349913600. Its totient is φ = 61931520.

The previous prime is 321475409. The next prime is 321475471. The reversal of 321475440 is 44574123.

It is an interprime number because it is at equal distance from previous prime (321475409) and next prime (321475471).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 321475398 and 321475407.

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 127 ways as a sum of consecutive naturals, for example, 11085346 + ... + 11085374.

It is an arithmetic number, because the mean of its divisors is an integer number (2109240).

Almost surely, 2^321475440 is an apocalyptic number.

321475440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321475440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (674956800).

321475440 is an abundant number, since it is smaller than the sum of its proper divisors (1028438160).

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

321475440 is a wasteful number, since it uses less digits than its factorization.

321475440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 321475440 is about 17929.7361943783. The cubic root of 321475440 is about 685.0400033469.

The spelling of 321475440 in words is "three hundred twenty-one million, four hundred seventy-five thousand, four hundred forty".