43821816 has 32 divisors (see below), whose sum is σ = 112104960. Its totient is φ = 14267232.

The previous prime is 43821803. The next prime is 43821829. The reversal of 43821816 is 61812834.

It is an interprime number because it is at equal distance from previous prime (43821803) and next prime (43821829).

It is a nude number because it is divisible by every one of its digits.

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, 20200 + ... + 22263.

It is an arithmetic number, because the mean of its divisors is an integer number (3503280).

Almost surely, 2^43821816 is an apocalyptic number.

It is an amenable number.

43821816 is an abundant number, since it is smaller than the sum of its proper divisors (68283144).

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

43821816 is a wasteful number, since it uses less digits than its factorization.

43821816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42515 (or 42511 counting only the distinct ones).

The product of its digits is 9216, while the sum is 33.

The square root of 43821816 is about 6619.8048309599. The cubic root of 43821816 is about 352.5576345578.

The spelling of 43821816 in words is "forty-three million, eight hundred twenty-one thousand, eight hundred sixteen".