84671999 has 4 divisors (see below), whose sum is σ = 89128440. Its totient is φ = 80215560.

The previous prime is 84671969. The next prime is 84672001. The reversal of 84671999 is 99917648.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84671999 - 2¹⁶ = 84606463 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84671999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84671969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2228192 + ... + 2228229.

It is an arithmetic number, because the mean of its divisors is an integer number (22282110).

Almost surely, 2^84671999 is an apocalyptic number.

84671999 is a deficient number, since it is larger than the sum of its proper divisors (4456441).

84671999 is a wasteful number, since it uses less digits than its factorization.

84671999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4456440.

The product of its digits is 979776, while the sum is 53.

The square root of 84671999 is about 9201.7389117492. The cubic root of 84671999 is about 439.1166834741.

The spelling of 84671999 in words is "eighty-four million, six hundred seventy-one thousand, nine hundred ninety-nine".