43909440 has 112 divisors (see below), whose sum is σ = 142207488. Its totient is φ = 11474944.

The previous prime is 43909433. The next prime is 43909457. The reversal of 43909440 is 4490934.

It is a happy number.

It is a super-2 number, since 2×43909440² = 3856077842227200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50449 + ... + 51311.

Almost surely, 2^43909440 is an apocalyptic number.

43909440 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 43909440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71103744).

43909440 is an abundant number, since it is smaller than the sum of its proper divisors (98298048).

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

43909440 is a wasteful number, since it uses less digits than its factorization.

43909440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936 (or 926 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 43909440 is about 6626.4198478515. The cubic root of 43909440 is about 352.7924638844.

The spelling of 43909440 in words is "forty-three million, nine hundred nine thousand, four hundred forty".