16640393 has 16 divisors (see below), whose sum is σ = 20870784. Its totient is φ = 12888960.

The previous prime is 16640387. The next prime is 16640401. The reversal of 16640393 is 39304661.

It is a happy number.

It is not a de Polignac number, because 16640393 - 2⁶ = 16640329 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16640353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14621 + ... + 15717.

It is an arithmetic number, because the mean of its divisors is an integer number (1304424).

Almost surely, 2^16640393 is an apocalyptic number.

It is an amenable number.

16640393 is a deficient number, since it is larger than the sum of its proper divisors (4230391).

16640393 is a wasteful number, since it uses less digits than its factorization.

16640393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 16640393 is about 4079.2637816155. The cubic root of 16640393 is about 255.3021818137.

The spelling of 16640393 in words is "sixteen million, six hundred forty thousand, three hundred ninety-three".