16389864 has 48 divisors (see below), whose sum is σ = 46038720. Its totient is φ = 5462640.

The previous prime is 16389833. The next prime is 16389883. The reversal of 16389864 is 46898361.

16389864 is a `hidden beast` number, since 1 + 638 + 9 + 8 + 6 + 4 = 666.

It is a nude number because it is divisible by every one of its digits.

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 11 ways as a sum of consecutive naturals, for example, 2272 + ... + 6159.

It is an arithmetic number, because the mean of its divisors is an integer number (959140).

Almost surely, 2^16389864 is an apocalyptic number.

It is an amenable number.

16389864 is an abundant number, since it is smaller than the sum of its proper divisors (29648856).

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

16389864 is an equidigital number, since it uses as much as digits as its factorization.

16389864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8452 (or 8436 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 16389864 is about 4048.4396994398. The cubic root of 16389864 is about 254.0144658717.

The spelling of 16389864 in words is "sixteen million, three hundred eighty-nine thousand, eight hundred sixty-four".