16938813 has 16 divisors (see below), whose sum is σ = 23584320. Its totient is φ = 10800384.

The previous prime is 16938809. The next prime is 16938821. The reversal of 16938813 is 31883961.

It is not a de Polignac number, because 16938813 - 2² = 16938809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16938893) 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 in 15 ways as a sum of consecutive naturals, for example, 8970 + ... + 10692.

It is an arithmetic number, because the mean of its divisors is an integer number (1474020).

Almost surely, 2^16938813 is an apocalyptic number.

It is an amenable number.

16938813 is a deficient number, since it is larger than the sum of its proper divisors (6645507).

16938813 is a wasteful number, since it uses less digits than its factorization.

16938813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868.

The product of its digits is 31104, while the sum is 39.

The square root of 16938813 is about 4115.6789233370. The cubic root of 16938813 is about 256.8192999683.

The spelling of 16938813 in words is "sixteen million, nine hundred thirty-eight thousand, eight hundred thirteen".