16399986 has 8 divisors (see below), whose sum is σ = 32799984. Its totient is φ = 5466660.

The previous prime is 16399979. The next prime is 16399987. The reversal of 16399986 is 68999361.

It is a sphenic number, since it is the product of 3 distinct primes.

16399986 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (16399987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1366660 + ... + 1366671.

It is an arithmetic number, because the mean of its divisors is an integer number (4099998).

Almost surely, 2^16399986 is an apocalyptic number.

16399986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

16399986 is a wasteful number, since it uses less digits than its factorization.

16399986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2733336.

The product of its digits is 629856, while the sum is 51.

The square root of 16399986 is about 4049.6896177362. The cubic root of 16399986 is about 254.0667462590.

The spelling of 16399986 in words is "sixteen million, three hundred ninety-nine thousand, nine hundred eighty-six".