7216987 has 2 divisors, whose sum is σ = 7216988. Its totient is φ = 7216986.

The previous prime is 7216981. The next prime is 7216997. The reversal of 7216987 is 7896127.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7216987 is a prime.

It is an alternating number because its digits alternate between odd and even.

7216987 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7216981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3608493 + 3608494.

It is an arithmetic number, because the mean of its divisors is an integer number (3608494).

Almost surely, 2^7216987 is an apocalyptic number.

7216987 is a deficient number, since it is larger than the sum of its proper divisors (1).

7216987 is an equidigital number, since it uses as much as digits as its factorization.

7216987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 7216987 is about 2686.4450487587. The cubic root of 7216987 is about 193.2496166148.

The spelling of 7216987 in words is "seven million, two hundred sixteen thousand, nine hundred eighty-seven".