16399943 has 8 divisors (see below), whose sum is σ = 19557888. Its totient is φ = 13445784.

The previous prime is 16399939. The next prime is 16399967. The reversal of 16399943 is 34999361.

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

It is a cyclic number.

It is not a de Polignac number, because 16399943 - 2² = 16399939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16399894 and 16399903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16399343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50771 + ... + 51092.

It is an arithmetic number, because the mean of its divisors is an integer number (2444736).

Almost surely, 2^16399943 is an apocalyptic number.

16399943 is a deficient number, since it is larger than the sum of its proper divisors (3157945).

16399943 is a wasteful number, since it uses less digits than its factorization.

16399943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101893.

The product of its digits is 157464, while the sum is 44.

The square root of 16399943 is about 4049.6843086838. The cubic root of 16399943 is about 254.0665242085.

The spelling of 16399943 in words is "sixteen million, three hundred ninety-nine thousand, nine hundred forty-three".