43986440 has 32 divisors (see below), whose sum is σ = 101387160. Its totient is φ = 17164800.

The previous prime is 43986433. The next prime is 43986443. The reversal of 43986440 is 4468934.

It can be written as a sum of positive squares in 4 ways, for example, as 32467204 + 11519236 = 5698^2 + 3394^2 .

It is a junction number, because it is equal to n+sod(n) for n = 43986394 and 43986403.

It is not an unprimeable number, because it can be changed into a prime (43986443) 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, 11771 + ... + 15050.

Almost surely, 2^43986440 is an apocalyptic number.

43986440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43986440 is an abundant number, since it is smaller than the sum of its proper divisors (57400720).

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

43986440 is a wasteful number, since it uses less digits than its factorization.

43986440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26873 (or 26869 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 43986440 is about 6632.2273784906. The cubic root of 43986440 is about 352.9985635008.

The spelling of 43986440 in words is "forty-three million, nine hundred eighty-six thousand, four hundred forty".