83999989 has 8 divisors (see below), whose sum is σ = 86462720. Its totient is φ = 81572400.

The previous prime is 83999947. The next prime is 83999999. The reversal of 83999989 is 98999938.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83999989 - 2¹⁹ = 83475701 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 83999989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83999999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3897 + ... + 13534.

It is an arithmetic number, because the mean of its divisors is an integer number (10807840).

Almost surely, 2^83999989 is an apocalyptic number.

It is an amenable number.

83999989 is a deficient number, since it is larger than the sum of its proper divisors (2462731).

83999989 is a wasteful number, since it uses less digits than its factorization.

83999989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17571.

The product of its digits is 11337408, while the sum is 64.

The square root of 83999989 is about 9165.1507898125. The cubic root of 83999989 is about 437.9518948718.

The spelling of 83999989 in words is "eighty-three million, nine hundred ninety-nine thousand, nine hundred eighty-nine".