83431818 has 48 divisors (see below), whose sum is σ = 196602120. Its totient is φ = 25463808.

The previous prime is 83431813. The next prime is 83431823. The reversal of 83431818 is 81813438.

It is an interprime number because it is at equal distance from previous prime (83431813) and next prime (83431823).

It can be written as a sum of positive squares in 4 ways, for example, as 78907689 + 4524129 = 8883^2 + 2127^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (83431813) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7638 + ... + 15006.

Almost surely, 2^83431818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 83431818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98301060).

83431818 is an abundant number, since it is smaller than the sum of its proper divisors (113170302).

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

83431818 is a wasteful number, since it uses less digits than its factorization.

83431818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7431 (or 7428 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 83431818 is about 9134.1019262980. The cubic root of 83431818 is about 436.9622331899.

The spelling of 83431818 in words is "eighty-three million, four hundred thirty-one thousand, eight hundred eighteen".