16791993 has 12 divisors (see below), whose sum is σ = 24295908. Its totient is φ = 11175840.

The previous prime is 16791967. The next prime is 16792021. The reversal of 16791993 is 39919761.

It can be written as a sum of positive squares in 2 ways, for example, as 9566649 + 7225344 = 3093^2 + 2688^2 .

It is not a de Polignac number, because 16791993 - 2¹⁴ = 16775609 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16791293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6003 + ... + 8343.

It is an arithmetic number, because the mean of its divisors is an integer number (2024659).

Almost surely, 2^16791993 is an apocalyptic number.

It is an amenable number.

16791993 is a deficient number, since it is larger than the sum of its proper divisors (7503915).

16791993 is a wasteful number, since it uses less digits than its factorization.

16791993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144 (or 3141 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 16791993 is about 4097.8034359886. The cubic root of 16791993 is about 256.0751376531.

The spelling of 16791993 in words is "sixteen million, seven hundred ninety-one thousand, nine hundred ninety-three".