16813993 has 8 divisors (see below), whose sum is σ = 20227520. Its totient is φ = 13653360.

The previous prime is 16813991. The next prime is 16813999. The reversal of 16813993 is 39931861.

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

It is not a de Polignac number, because 16813993 - 2¹ = 16813991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16813991) 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, 63078 + ... + 63343.

It is an arithmetic number, because the mean of its divisors is an integer number (2528440).

Almost surely, 2^16813993 is an apocalyptic number.

It is an amenable number.

16813993 is a deficient number, since it is larger than the sum of its proper divisors (3413527).

16813993 is a wasteful number, since it uses less digits than its factorization.

16813993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126447.

The product of its digits is 34992, while the sum is 40.

The square root of 16813993 is about 4100.4869223057. The cubic root of 16813993 is about 256.1869209797.

It can be divided in two parts, 168 and 13993, that added together give a square (14161 = 119²).

The spelling of 16813993 in words is "sixteen million, eight hundred thirteen thousand, nine hundred ninety-three".