43688240 has 20 divisors (see below), whose sum is σ = 101575344. Its totient is φ = 17475264.

The previous prime is 43688219. The next prime is 43688243. The reversal of 43688240 is 4288634.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 43688240.

It is not an unprimeable number, because it can be changed into a prime (43688243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272972 + ... + 273131.

Almost surely, 2^43688240 is an apocalyptic number.

43688240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43688240 is an abundant number, since it is smaller than the sum of its proper divisors (57887104).

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

43688240 is a wasteful number, since it uses less digits than its factorization.

43688240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546116 (or 546110 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 43688240 is about 6609.7080117052. The cubic root of 43688240 is about 352.1990523616.

The spelling of 43688240 in words is "forty-three million, six hundred eighty-eight thousand, two hundred forty".