16697993 has 16 divisors (see below), whose sum is σ = 18547200. Its totient is φ = 14938560.

The previous prime is 16697981. The next prime is 16698001. The reversal of 16697993 is 39979661.

It is not a de Polignac number, because 16697993 - 2⁶ = 16697929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16697393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72803 + ... + 73031.

It is an arithmetic number, because the mean of its divisors is an integer number (1159200).

Almost surely, 2^16697993 is an apocalyptic number.

16697993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16697993 is a deficient number, since it is larger than the sum of its proper divisors (1849207).

16697993 is a wasteful number, since it uses less digits than its factorization.

16697993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392.

The product of its digits is 551124, while the sum is 50.

The square root of 16697993 is about 4086.3177801047. The cubic root of 16697993 is about 255.5964150659.

The spelling of 16697993 in words is "sixteen million, six hundred ninety-seven thousand, nine hundred ninety-three".