43939818 has 48 divisors (see below), whose sum is σ = 107933280. Its totient is φ = 12807072.

The previous prime is 43939817. The next prime is 43939829. The reversal of 43939818 is 81893934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43939813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 496 + ... + 9387.

It is an arithmetic number, because the mean of its divisors is an integer number (2248610).

Almost surely, 2^43939818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43939818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53966640).

43939818 is an abundant number, since it is smaller than the sum of its proper divisors (63993462).

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

43939818 is a wasteful number, since it uses less digits than its factorization.

43939818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9923 (or 9920 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 43939818 is about 6628.7116395269. The cubic root of 43939818 is about 352.8738029535.

The spelling of 43939818 in words is "forty-three million, nine hundred thirty-nine thousand, eight hundred eighteen".