43689040 has 40 divisors (see below), whose sum is σ = 102982248. Its totient is φ = 17233920.

The previous prime is 43689007. The next prime is 43689043. The reversal of 43689040 is 4098634.

It can be written as a sum of positive squares in 4 ways, for example, as 12418576 + 31270464 = 3524^2 + 5592^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×43689040² = 3817464432243200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43688987 and 43689005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43689043) 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, 2100 + ... + 9580.

Almost surely, 2^43689040 is an apocalyptic number.

43689040 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 43689040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51491124).

43689040 is an abundant number, since it is smaller than the sum of its proper divisors (59293208).

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

43689040 is a wasteful number, since it uses less digits than its factorization.

43689040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7567 (or 7561 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 43689040 is about 6609.7685284736. The cubic root of 43689040 is about 352.2012021203.

The spelling of 43689040 in words is "forty-three million, six hundred eighty-nine thousand, forty".