43978140 has 72 divisors (see below), whose sum is σ = 138356400. Its totient is φ = 11726208.

The previous prime is 43978111. The next prime is 43978147. The reversal of 43978140 is 4187934.

It is a happy number.

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 = 43978095 and 43978104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43978147) 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, 336 + ... + 9384.

Almost surely, 2^43978140 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 43978140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69178200).

43978140 is an abundant number, since it is smaller than the sum of its proper divisors (94378260).

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

43978140 is a wasteful number, since it uses less digits than its factorization.

43978140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9073 (or 9059 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 43978140 is about 6631.6016165026. The cubic root of 43978140 is about 352.9763591398.

The spelling of 43978140 in words is "forty-three million, nine hundred seventy-eight thousand, one hundred forty".