43287840 has 144 divisors (see below), whose sum is σ = 154260288. Its totient is φ = 11033088.

The previous prime is 43287821. The next prime is 43287847. The reversal of 43287840 is 4878234.

It is a tau number, because it is divible by the number of its divisors (144).

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 = 43287795 and 43287804.

It is not an unprimeable number, because it can be changed into a prime (43287847) 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, 32467 + ... + 33773.

It is an arithmetic number, because the mean of its divisors is an integer number (1071252).

Almost surely, 2^43287840 is an apocalyptic number.

43287840 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 43287840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77130144).

43287840 is an abundant number, since it is smaller than the sum of its proper divisors (110972448).

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

43287840 is a wasteful number, since it uses less digits than its factorization.

43287840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351 (or 1340 counting only the distinct ones).

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

The square root of 43287840 is about 6579.3495119199. The cubic root of 43287840 is about 351.1197876876.

The spelling of 43287840 in words is "forty-three million, two hundred eighty-seven thousand, eight hundred forty".