83989906 has 32 divisors (see below), whose sum is σ = 169158528. Its totient is φ = 30205440.

The previous prime is 83989903. The next prime is 83989909. The reversal of 83989906 is 60998938.

It is an interprime number because it is at equal distance from previous prime (83989903) and next prime (83989909).

It is not an unprimeable number, because it can be changed into a prime (83989901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18975 + ... + 22978.

It is an arithmetic number, because the mean of its divisors is an integer number (5286204).

Almost surely, 2^83989906 is an apocalyptic number.

83989906 is an abundant number, since it is smaller than the sum of its proper divisors (85168622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

83989906 is a wasteful number, since it uses less digits than its factorization.

83989906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41986.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 83989906 is about 9164.6007005215. The cubic root of 83989906 is about 437.9343708788.

It can be divided in two parts, 83 and 989906, that added together give a palindrome (989989).

The spelling of 83989906 in words is "eighty-three million, nine hundred eighty-nine thousand, nine hundred six".