84087999 has 6 divisors (see below), whose sum is σ = 121460456. Its totient is φ = 56058660.

The previous prime is 84087989. The next prime is 84088003. The reversal of 84087999 is 99978048.

It is not a de Polignac number, because 84087999 - 2⁸ = 84087743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84087929) 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 in 5 ways as a sum of consecutive naturals, for example, 4671547 + ... + 4671564.

Almost surely, 2^84087999 is an apocalyptic number.

84087999 is a deficient number, since it is larger than the sum of its proper divisors (37372457).

84087999 is a wasteful number, since it uses less digits than its factorization.

84087999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9343117 (or 9343114 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 84087999 is about 9169.9508722784. The cubic root of 84087999 is about 438.1047944661.

The spelling of 84087999 in words is "eighty-four million, eighty-seven thousand, nine hundred ninety-nine".