16938979 has 2 divisors, whose sum is σ = 16938980. Its totient is φ = 16938978.

The previous prime is 16938931. The next prime is 16938983. The reversal of 16938979 is 97983961.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16938979 is a prime.

It is not a weakly prime, because it can be changed into another prime (16938079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8469489 + 8469490.

It is an arithmetic number, because the mean of its divisors is an integer number (8469490).

Almost surely, 2^16938979 is an apocalyptic number.

16938979 is a deficient number, since it is larger than the sum of its proper divisors (1).

16938979 is an equidigital number, since it uses as much as digits as its factorization.

16938979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 52.

The square root of 16938979 is about 4115.6990900696. The cubic root of 16938979 is about 256.8201389068.

The spelling of 16938979 in words is "sixteen million, nine hundred thirty-eight thousand, nine hundred seventy-nine".