3999893 has 2 divisors, whose sum is σ = 3999894. Its totient is φ = 3999892.

The previous prime is 3999871. The next prime is 3999901. The reversal of 3999893 is 3989993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3694084 + 305809 = 1922^2 + 553^2 .

It is a cyclic number.

It is not a de Polignac number, because 3999893 - 2⁸ = 3999637 is a prime.

It is a super-2 number, since 2×3999893² = 31998288022898, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3999803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999946 + 1999947.

It is an arithmetic number, because the mean of its divisors is an integer number (1999947).

Almost surely, 2^3999893 is an apocalyptic number.

It is an amenable number.

3999893 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999893 is an equidigital number, since it uses as much as digits as its factorization.

3999893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 50.

The square root of 3999893 is about 1999.9732498211. The cubic root of 3999893 is about 158.7386897516.

The spelling of 3999893 in words is "three million, nine hundred ninety-nine thousand, eight hundred ninety-three".