83919989 has 4 divisors (see below), whose sum is σ = 85966860. Its totient is φ = 81873120.

The previous prime is 83919977. The next prime is 83920003. The reversal of 83919989 is 98991938.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34456900 + 49463089 = 5870^2 + 7033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83919989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83919919) 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, 1023374 + ... + 1023455.

It is an arithmetic number, because the mean of its divisors is an integer number (21491715).

Almost surely, 2^83919989 is an apocalyptic number.

It is an amenable number.

83919989 is a deficient number, since it is larger than the sum of its proper divisors (2046871).

83919989 is a wasteful number, since it uses less digits than its factorization.

83919989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046870.

The product of its digits is 1259712, while the sum is 56.

The square root of 83919989 is about 9160.7853920938. The cubic root of 83919989 is about 437.8128183454.

The spelling of 83919989 in words is "eighty-three million, nine hundred nineteen thousand, nine hundred eighty-nine".