43640520 has 128 divisors (see below), whose sum is σ = 163261440. Its totient is φ = 9066240.

The previous prime is 43640503. The next prime is 43640533. The reversal of 43640520 is 2504634.

43640520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6879 + ... + 11601.

It is an arithmetic number, because the mean of its divisors is an integer number (1275480).

Almost surely, 2^43640520 is an apocalyptic number.

43640520 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 43640520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81630720).

43640520 is an abundant number, since it is smaller than the sum of its proper divisors (119620920).

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

43640520 is a wasteful number, since it uses less digits than its factorization.

43640520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4755 (or 4751 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 43640520 is about 6606.0971836630. The cubic root of 43640520 is about 352.0707717548.

The spelling of 43640520 in words is "forty-three million, six hundred forty thousand, five hundred twenty".