16939817 has 4 divisors (see below), whose sum is σ = 17014020. Its totient is φ = 16865616.

The previous prime is 16939801. The next prime is 16939823. The reversal of 16939817 is 71893961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71893961 = 71 ⋅1012591.

It can be written as a sum of positive squares in 2 ways, for example, as 14318656 + 2621161 = 3784^2 + 1619^2 .

It is a cyclic number.

It is not a de Polignac number, because 16939817 - 2⁴ = 16939801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16935817) 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 in 3 ways as a sum of consecutive naturals, for example, 36758 + ... + 37215.

It is an arithmetic number, because the mean of its divisors is an integer number (4253505).

Almost surely, 2^16939817 is an apocalyptic number.

It is an amenable number.

16939817 is a deficient number, since it is larger than the sum of its proper divisors (74203).

16939817 is an equidigital number, since it uses as much as digits as its factorization.

16939817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74202.

The product of its digits is 81648, while the sum is 44.

The square root of 16939817 is about 4115.8008941153. The cubic root of 16939817 is about 256.8243739461.

The spelling of 16939817 in words is "sixteen million, nine hundred thirty-nine thousand, eight hundred seventeen".