16321864 has 16 divisors (see below), whose sum is σ = 32957820. Its totient is φ = 7533120.

The previous prime is 16321843. The next prime is 16321871. The reversal of 16321864 is 46812361.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15665764 + 656100 = 3958^2 + 810^2 .

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, 78367 + ... + 78574.

Almost surely, 2^16321864 is an apocalyptic number.

It is an amenable number.

16321864 is an abundant number, since it is smaller than the sum of its proper divisors (16635956).

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

16321864 is a wasteful number, since it uses less digits than its factorization.

16321864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156960 (or 156956 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 16321864 is about 4040.0326731352. The cubic root of 16321864 is about 253.6626848993.

The spelling of 16321864 in words is "sixteen million, three hundred twenty-one thousand, eight hundred sixty-four".