7157987 has 2 divisors, whose sum is σ = 7157988. Its totient is φ = 7157986.

The previous prime is 7157981. The next prime is 7157999. The reversal of 7157987 is 7897517.

It is a weak prime.

It is an emirp because it is prime and its reverse (7897517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7157987 - 2¹² = 7153891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7157981) 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, 3578993 + 3578994.

It is an arithmetic number, because the mean of its divisors is an integer number (3578994).

Almost surely, 2^7157987 is an apocalyptic number.

7157987 is a deficient number, since it is larger than the sum of its proper divisors (1).

7157987 is an equidigital number, since it uses as much as digits as its factorization.

7157987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123480, while the sum is 44.

The square root of 7157987 is about 2675.4414588998. The cubic root of 7157987 is about 192.7215597045.

The spelling of 7157987 in words is "seven million, one hundred fifty-seven thousand, nine hundred eighty-seven".