16649393 has 8 divisors (see below), whose sum is σ = 17280000. Its totient is φ = 16022608.

The previous prime is 16649389. The next prime is 16649431. The reversal of 16649393 is 39394661.

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 16649393 - 2² = 16649389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16649393.

It is not an unprimeable number, because it can be changed into a prime (16649323) 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 7 ways as a sum of consecutive naturals, for example, 10358 + ... + 11856.

It is an arithmetic number, because the mean of its divisors is an integer number (2160000).

Almost surely, 2^16649393 is an apocalyptic number.

It is an amenable number.

16649393 is a deficient number, since it is larger than the sum of its proper divisors (630607).

16649393 is a wasteful number, since it uses less digits than its factorization.

16649393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911.

The product of its digits is 104976, while the sum is 41.

The square root of 16649393 is about 4080.3667727301. The cubic root of 16649393 is about 255.3482004688.

The spelling of 16649393 in words is "sixteen million, six hundred forty-nine thousand, three hundred ninety-three".