7987009 has 2 divisors, whose sum is σ = 7987010. Its totient is φ = 7987008.

The previous prime is 7986997. The next prime is 7987013. The reversal of 7987009 is 9007897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7182400 + 804609 = 2680^2 + 897^2 .

It is a cyclic number.

It is not a de Polignac number, because 7987009 - 2²¹ = 5889857 is a prime.

It is not a weakly prime, because it can be changed into another prime (7987019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3993504 + 3993505.

It is an arithmetic number, because the mean of its divisors is an integer number (3993505).

Almost surely, 2^7987009 is an apocalyptic number.

It is an amenable number.

7987009 is a deficient number, since it is larger than the sum of its proper divisors (1).

7987009 is an equidigital number, since it uses as much as digits as its factorization.

7987009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 7987009 is about 2826.1296856302. The cubic root of 7987009 is about 199.8916830144.

The spelling of 7987009 in words is "seven million, nine hundred eighty-seven thousand, nine".