8387993 has 2 divisors, whose sum is σ = 8387994. Its totient is φ = 8387992.

The previous prime is 8387959. The next prime is 8387999. The reversal of 8387993 is 3997838.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7333264 + 1054729 = 2708^2 + 1027^2 .

It is a cyclic number.

It is not a de Polignac number, because 8387993 - 2⁸ = 8387737 is a prime.

It is not a weakly prime, because it can be changed into another prime (8387999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4193996 + 4193997.

It is an arithmetic number, because the mean of its divisors is an integer number (4193997).

Almost surely, 2^8387993 is an apocalyptic number.

It is an amenable number.

8387993 is a deficient number, since it is larger than the sum of its proper divisors (1).

8387993 is an equidigital number, since it uses as much as digits as its factorization.

8387993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 8387993 is about 2896.2032041968. The cubic root of 8387993 is about 203.1823690579.

The spelling of 8387993 in words is "eight million, three hundred eighty-seven thousand, nine hundred ninety-three".