84681999 has 6 divisors (see below), whose sum is σ = 122318456. Its totient is φ = 56454660.

The previous prime is 84681967. The next prime is 84682019. The reversal of 84681999 is 99918648.

It is not a de Polignac number, because 84681999 - 2⁵ = 84681967 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 (84681299) 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 in 5 ways as a sum of consecutive naturals, for example, 4704547 + ... + 4704564.

Almost surely, 2^84681999 is an apocalyptic number.

84681999 is a deficient number, since it is larger than the sum of its proper divisors (37636457).

84681999 is a wasteful number, since it uses less digits than its factorization.

84681999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9409117 (or 9409114 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 84681999 is about 9202.2822712629. The cubic root of 84681999 is about 439.1339697632.

The spelling of 84681999 in words is "eighty-four million, six hundred eighty-one thousand, nine hundred ninety-nine".