16638073 has 4 divisors (see below), whose sum is σ = 16653940. Its totient is φ = 16622208.

The previous prime is 16638023. The next prime is 16638077. The reversal of 16638073 is 37083661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37083661 = 4973 ⋅7457.

It can be written as a sum of positive squares in 2 ways, for example, as 7469289 + 9168784 = 2733^2 + 3028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16638073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16638077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6240 + ... + 8497.

It is an arithmetic number, because the mean of its divisors is an integer number (4163485).

Almost surely, 2^16638073 is an apocalyptic number.

It is an amenable number.

16638073 is a deficient number, since it is larger than the sum of its proper divisors (15867).

16638073 is a wasteful number, since it uses less digits than its factorization.

16638073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15866.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 16638073 is about 4078.9794066653. The cubic root of 16638073 is about 255.2903165373.

The spelling of 16638073 in words is "sixteen million, six hundred thirty-eight thousand, seventy-three".