321943916 has 24 divisors (see below), whose sum is σ = 657031200. Its totient is φ = 137975376.

The previous prime is 321943871. The next prime is 321943927. The reversal of 321943916 is 619349123.

It is a self number, because there is not a number n which added to its sum of digits gives 321943916.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115955 + ... + 118698.

It is an arithmetic number, because the mean of its divisors is an integer number (27376300).

Almost surely, 2^321943916 is an apocalyptic number.

It is an amenable number.

321943916 is an abundant number, since it is smaller than the sum of its proper divisors (335087284).

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

321943916 is a wasteful number, since it uses less digits than its factorization.

321943916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234678 (or 234662 counting only the distinct ones).

The product of its digits is 34992, while the sum is 38.

The square root of 321943916 is about 17942.7956573105. The cubic root of 321943916 is about 685.3726042194.

The spelling of 321943916 in words is "three hundred twenty-one million, nine hundred forty-three thousand, nine hundred sixteen".