43278840 has 128 divisors (see below), whose sum is σ = 157420800. Its totient is φ = 10488960.

The previous prime is 43278797. The next prime is 43278841. The reversal of 43278840 is 4887234.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 43278795 and 43278804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43278841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10059 + ... + 13701.

It is an arithmetic number, because the mean of its divisors is an integer number (1229850).

Almost surely, 2^43278840 is an apocalyptic number.

43278840 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 43278840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78710400).

43278840 is an abundant number, since it is smaller than the sum of its proper divisors (114141960).

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

43278840 is a wasteful number, since it uses less digits than its factorization.

43278840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674 (or 3664 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 43278840 is about 6578.6655181731. The cubic root of 43278840 is about 351.0954521612.

The spelling of 43278840 in words is "forty-three million, two hundred seventy-eight thousand, eight hundred forty".