7993987 has 2 divisors, whose sum is σ = 7993988. Its totient is φ = 7993986.

The previous prime is 7993967. The next prime is 7994017. The reversal of 7993987 is 7893997.

It is a weak prime.

It is an emirp because it is prime and its reverse (7893997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7993987 - 2¹¹ = 7991939 is a prime.

It is not a weakly prime, because it can be changed into another prime (7993907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3996993 + 3996994.

It is an arithmetic number, because the mean of its divisors is an integer number (3996994).

Almost surely, 2^7993987 is an apocalyptic number.

7993987 is a deficient number, since it is larger than the sum of its proper divisors (1).

7993987 is an equidigital number, since it uses as much as digits as its factorization.

7993987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 52.

The square root of 7993987 is about 2827.3639666658. The cubic root of 7993987 is about 199.9498791072.

The spelling of 7993987 in words is "seven million, nine hundred ninety-three thousand, nine hundred eighty-seven".