16640933 has 2 divisors, whose sum is σ = 16640934. Its totient is φ = 16640932.

The previous prime is 16640917. The next prime is 16640951. The reversal of 16640933 is 33904661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14010049 + 2630884 = 3743^2 + 1622^2 .

It is a cyclic number.

It is not a de Polignac number, because 16640933 - 2⁴ = 16640917 is a prime.

It is a super-2 number, since 2×16640933² = 553841302220978, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16640933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16640033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8320466 + 8320467.

It is an arithmetic number, because the mean of its divisors is an integer number (8320467).

Almost surely, 2^16640933 is an apocalyptic number.

It is an amenable number.

16640933 is a deficient number, since it is larger than the sum of its proper divisors (1).

16640933 is an equidigital number, since it uses as much as digits as its factorization.

16640933 is an odious number, because the sum of its binary digits is odd.

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

The square root of 16640933 is about 4079.3299694925. The cubic root of 16640933 is about 255.3049434009.

The spelling of 16640933 in words is "sixteen million, six hundred forty thousand, nine hundred thirty-three".