43939840 has 96 divisors (see below), whose sum is σ = 120687840. Its totient is φ = 15040512.

The previous prime is 43939829. The next prime is 43939859. The reversal of 43939840 is 4893934.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 43939793 and 43939802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71374 + ... + 71986.

It is an arithmetic number, because the mean of its divisors is an integer number (1257165).

Almost surely, 2^43939840 is an apocalyptic number.

43939840 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 43939840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60343920).

43939840 is an abundant number, since it is smaller than the sum of its proper divisors (76748000).

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

43939840 is an equidigital number, since it uses as much as digits as its factorization.

43939840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 43939840 is about 6628.7132989744. The cubic root of 43939840 is about 352.8738618463.

The spelling of 43939840 in words is "forty-three million, nine hundred thirty-nine thousand, eight hundred forty".