43821036 has 144 divisors (see below), whose sum is σ = 137277504. Its totient is φ = 11501568.

The previous prime is 43821031. The next prime is 43821047. The reversal of 43821036 is 63012834.

It is a happy number.

It is a super-2 number, since 2×43821036² = 3840566392226592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43821031) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 226956 + ... + 227148.

It is an arithmetic number, because the mean of its divisors is an integer number (953316).

Almost surely, 2^43821036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43821036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68638752).

43821036 is an abundant number, since it is smaller than the sum of its proper divisors (93456468).

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

43821036 is a wasteful number, since it uses less digits than its factorization.

43821036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 43821036 is about 6619.7459165741. The cubic root of 43821036 is about 352.5555427794. Note that the first 4 decimals are identical.

The spelling of 43821036 in words is "forty-three million, eight hundred twenty-one thousand, thirty-six".