7915987 has 2 divisors, whose sum is σ = 7915988. Its totient is φ = 7915986.

The previous prime is 7915969. The next prime is 7916011. The reversal of 7915987 is 7895197.

7915987 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7915987 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (7915087) 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, 3957993 + 3957994.

It is an arithmetic number, because the mean of its divisors is an integer number (3957994).

Almost surely, 2^7915987 is an apocalyptic number.

7915987 is a deficient number, since it is larger than the sum of its proper divisors (1).

7915987 is an equidigital number, since it uses as much as digits as its factorization.

7915987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 46.

The square root of 7915987 is about 2813.5363868271. The cubic root of 7915987 is about 199.2974265091.

The spelling of 7915987 in words is "seven million, nine hundred fifteen thousand, nine hundred eighty-seven".