43978340 has 48 divisors (see below), whose sum is σ = 107557632. Its totient is φ = 14791296.

The previous prime is 43978327. The next prime is 43978343. The reversal of 43978340 is 4387934.

43978340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 43978294 and 43978303.

It is not an unprimeable number, because it can be changed into a prime (43978343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4457 + ... + 10383.

It is an arithmetic number, because the mean of its divisors is an integer number (2240784).

Almost surely, 2^43978340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43978340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53778816).

43978340 is an abundant number, since it is smaller than the sum of its proper divisors (63579292).

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

43978340 is a wasteful number, since it uses less digits than its factorization.

43978340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5996 (or 5994 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 43978340 is about 6631.6166957990. The cubic root of 43978340 is about 352.9768942175.

The spelling of 43978340 in words is "forty-three million, nine hundred seventy-eight thousand, three hundred forty".