7918987 has 2 divisors, whose sum is σ = 7918988. Its totient is φ = 7918986.

The previous prime is 7918979. The next prime is 7919003. The reversal of 7918987 is 7898197.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7918987 - 2³ = 7918979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7918987.

It is not a weakly prime, because it can be changed into another prime (7918387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3959493 + 3959494.

It is an arithmetic number, because the mean of its divisors is an integer number (3959494).

Almost surely, 2^7918987 is an apocalyptic number.

7918987 is a deficient number, since it is larger than the sum of its proper divisors (1).

7918987 is an equidigital number, since it uses as much as digits as its factorization.

7918987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 49.

The square root of 7918987 is about 2814.0694732007. The cubic root of 7918987 is about 199.3225999025.

The spelling of 7918987 in words is "seven million, nine hundred eighteen thousand, nine hundred eighty-seven".