43888221 has 12 divisors (see below), whose sum is σ = 68270748. Its totient is φ = 27008064.

The previous prime is 43888217. The next prime is 43888231. The reversal of 43888221 is 12288834.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19236996 + 24651225 = 4386^2 + 4965^2 .

It is not a de Polignac number, because 43888221 - 2² = 43888217 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43888231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187440 + ... + 187673.

It is an arithmetic number, because the mean of its divisors is an integer number (5689229).

Almost surely, 2^43888221 is an apocalyptic number.

It is an amenable number.

43888221 is a deficient number, since it is larger than the sum of its proper divisors (24382527).

43888221 is a wasteful number, since it uses less digits than its factorization.

43888221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375132 (or 375129 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 43888221 is about 6624.8185635533. The cubic root of 43888221 is about 352.7356263762.

The spelling of 43888221 in words is "forty-three million, eight hundred eighty-eight thousand, two hundred twenty-one".