16942993 has 4 divisors (see below), whose sum is σ = 16952560. Its totient is φ = 16933428.

The previous prime is 16942967. The next prime is 16942997. The reversal of 16942993 is 39924961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 39924961 = 37 ⋅1079053.

It is a cyclic number.

It is not a de Polignac number, because 16942993 - 2⁹ = 16942481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16942997) 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, 1263 + ... + 5956.

It is an arithmetic number, because the mean of its divisors is an integer number (4238140).

Almost surely, 2^16942993 is an apocalyptic number.

It is an amenable number.

16942993 is a deficient number, since it is larger than the sum of its proper divisors (9567).

16942993 is an equidigital number, since it uses as much as digits as its factorization.

16942993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9566.

The product of its digits is 104976, while the sum is 43.

The square root of 16942993 is about 4116.1867061638. The cubic root of 16942993 is about 256.8404233765.

The spelling of 16942993 in words is "sixteen million, nine hundred forty-two thousand, nine hundred ninety-three".