16993943 has 2 divisors, whose sum is σ = 16993944. Its totient is φ = 16993942.

The previous prime is 16993939. The next prime is 16993969. The reversal of 16993943 is 34939961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16993943 - 2² = 16993939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16993894 and 16993903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16993903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8496971 + 8496972.

It is an arithmetic number, because the mean of its divisors is an integer number (8496972).

Almost surely, 2^16993943 is an apocalyptic number.

16993943 is the 2204-th centered heptagonal number.

16993943 is a deficient number, since it is larger than the sum of its proper divisors (1).

16993943 is an equidigital number, since it uses as much as digits as its factorization.

16993943 is an evil number, because the sum of its binary digits is even.

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

The square root of 16993943 is about 4122.3710410394. The cubic root of 16993943 is about 257.0976176881.

The spelling of 16993943 in words is "sixteen million, nine hundred ninety-three thousand, nine hundred forty-three".