16993939 has 2 divisors, whose sum is σ = 16993940. Its totient is φ = 16993938.

The previous prime is 16993937. The next prime is 16993943. The reversal of 16993939 is 93939961.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16993939 - 2¹ = 16993937 is a prime.

Together with 16993937, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 16993892 and 16993901.

It is not a weakly prime, because it can be changed into another prime (16993937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8496969 + 8496970.

It is an arithmetic number, because the mean of its divisors is an integer number (8496970).

Almost surely, 2^16993939 is an apocalyptic number.

16993939 is a deficient number, since it is larger than the sum of its proper divisors (1).

16993939 is an equidigital number, since it uses as much as digits as its factorization.

16993939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 354294, while the sum is 49.

The square root of 16993939 is about 4122.3705558817. The cubic root of 16993939 is about 257.0975975164.

The spelling of 16993939 in words is "sixteen million, nine hundred ninety-three thousand, nine hundred thirty-nine".