84085987 has 2 divisors, whose sum is σ = 84085988. Its totient is φ = 84085986.

The previous prime is 84085973. The next prime is 84086017. The reversal of 84085987 is 78958048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84085987 - 2¹¹ = 84083939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84085987.

It is not a weakly prime, because it can be changed into another prime (84085487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42042993 + 42042994.

It is an arithmetic number, because the mean of its divisors is an integer number (42042994).

Almost surely, 2^84085987 is an apocalyptic number.

84085987 is a deficient number, since it is larger than the sum of its proper divisors (1).

84085987 is an equidigital number, since it uses as much as digits as its factorization.

84085987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 49.

The square root of 84085987 is about 9169.8411654728. The cubic root of 84085987 is about 438.1013002145.

The spelling of 84085987 in words is "eighty-four million, eighty-five thousand, nine hundred eighty-seven".