43818640 has 40 divisors (see below), whose sum is σ = 102850560. Its totient is φ = 17360256.

The previous prime is 43818613. The next prime is 43818641. The reversal of 43818640 is 4681834.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×43818640² = 3840146422899200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43818596 and 43818605.

It is not an unprimeable number, because it can be changed into a prime (43818641) 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, 6001 + ... + 11119.

It is an arithmetic number, because the mean of its divisors is an integer number (2571264).

Almost surely, 2^43818640 is an apocalyptic number.

43818640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43818640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51425280).

43818640 is an abundant number, since it is smaller than the sum of its proper divisors (59031920).

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

43818640 is a wasteful number, since it uses less digits than its factorization.

43818640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5239 (or 5233 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 43818640 is about 6619.5649403869. The cubic root of 43818640 is about 352.5491171099.

The spelling of 43818640 in words is "forty-three million, eight hundred eighteen thousand, six hundred forty".