86387993 has 2 divisors, whose sum is σ = 86387994. Its totient is φ = 86387992.

The previous prime is 86387971. The next prime is 86388011. The reversal of 86387993 is 39978368.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57957769 + 28430224 = 7613^2 + 5332^2 .

It is a cyclic number.

It is not a de Polignac number, because 86387993 - 2¹² = 86383897 is a prime.

It is not a weakly prime, because it can be changed into another prime (86387923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43193996 + 43193997.

It is an arithmetic number, because the mean of its divisors is an integer number (43193997).

Almost surely, 2^86387993 is an apocalyptic number.

It is an amenable number.

86387993 is a deficient number, since it is larger than the sum of its proper divisors (1).

86387993 is an equidigital number, since it uses as much as digits as its factorization.

86387993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 86387993 is about 9294.5141346926. The cubic root of 86387993 is about 442.0633001075.

The spelling of 86387993 in words is "eighty-six million, three hundred eighty-seven thousand, nine hundred ninety-three".