999983893 has 2 divisors, whose sum is σ = 999983894. Its totient is φ = 999983892.

The previous prime is 999983869. The next prime is 999983921. The reversal of 999983893 is 398389999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 934341489 + 65642404 = 30567^2 + 8102^2 .

It is a cyclic number.

It is not a de Polignac number, because 999983893 - 2⁹ = 999983381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999983293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499991946 + 499991947.

It is an arithmetic number, because the mean of its divisors is an integer number (499991947).

Almost surely, 2^999983893 is an apocalyptic number.

It is an amenable number.

999983893 is a deficient number, since it is larger than the sum of its proper divisors (1).

999983893 is an equidigital number, since it uses as much as digits as its factorization.

999983893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34012224, while the sum is 67.

The square root of 999983893 is about 31622.5219266269. The cubic root of 999983893 is about 999.9946309712.

The spelling of 999983893 in words is "nine hundred ninety-nine million, nine hundred eighty-three thousand, eight hundred ninety-three".