87938993 has 2 divisors, whose sum is σ = 87938994. Its totient is φ = 87938992.

The previous prime is 87938953. The next prime is 87939001. The reversal of 87938993 is 39983978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75463969 + 12475024 = 8687^2 + 3532^2 .

It is a cyclic number.

It is not a de Polignac number, because 87938993 - 2¹⁴ = 87922609 is a prime.

It is not a weakly prime, because it can be changed into another prime (87938923) 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, 43969496 + 43969497.

It is an arithmetic number, because the mean of its divisors is an integer number (43969497).

Almost surely, 2^87938993 is an apocalyptic number.

It is an amenable number.

87938993 is a deficient number, since it is larger than the sum of its proper divisors (1).

87938993 is an equidigital number, since it uses as much as digits as its factorization.

87938993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 56.

The square root of 87938993 is about 9377.5792718590. The cubic root of 87938993 is about 444.6932077207.

The spelling of 87938993 in words is "eighty-seven million, nine hundred thirty-eight thousand, nine hundred ninety-three".