84123999 has 6 divisors (see below), whose sum is σ = 121512456. Its totient is φ = 56082660.

The previous prime is 84123989. The next prime is 84124009. The reversal of 84123999 is 99932148.

It is an interprime number because it is at equal distance from previous prime (84123989) and next prime (84124009).

It is not a de Polignac number, because 84123999 - 2¹⁶ = 84058463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84123989) 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, 4673547 + ... + 4673564.

It is an arithmetic number, because the mean of its divisors is an integer number (20252076).

Almost surely, 2^84123999 is an apocalyptic number.

84123999 is a deficient number, since it is larger than the sum of its proper divisors (37388457).

84123999 is a wasteful number, since it uses less digits than its factorization.

84123999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9347117 (or 9347114 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 84123999 is about 9171.9135953191. The cubic root of 84123999 is about 438.1673064479.

The spelling of 84123999 in words is "eighty-four million, one hundred twenty-three thousand, nine hundred ninety-nine".