16649693 has 8 divisors (see below), whose sum is σ = 16880088. Its totient is φ = 16421184.

The previous prime is 16649687. The next prime is 16649753. The reversal of 16649693 is 39694661.

It can be written as a sum of positive squares in 4 ways, for example, as 432964 + 16216729 = 658^2 + 4027^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16649693 - 2¹⁸ = 16387549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16649603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26855 + ... + 27467.

It is an arithmetic number, because the mean of its divisors is an integer number (2110011).

Almost surely, 2^16649693 is an apocalyptic number.

It is an amenable number.

16649693 is a deficient number, since it is larger than the sum of its proper divisors (230395).

16649693 is a wasteful number, since it uses less digits than its factorization.

16649693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943.

The product of its digits is 209952, while the sum is 44.

The square root of 16649693 is about 4080.4035339657. The cubic root of 16649693 is about 255.3497341383.

The spelling of 16649693 in words is "sixteen million, six hundred forty-nine thousand, six hundred ninety-three".