43406221 has 8 divisors (see below), whose sum is σ = 46347840. Its totient is φ = 40552512.

The previous prime is 43406213. The next prime is 43406273. The reversal of 43406221 is 12260434.

It is a happy number.

43406221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43406221 - 2³ = 43406213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43406192 and 43406201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43406201) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 20956 + ... + 22933.

It is an arithmetic number, because the mean of its divisors is an integer number (5793480).

Almost surely, 2^43406221 is an apocalyptic number.

It is an amenable number.

43406221 is a deficient number, since it is larger than the sum of its proper divisors (2941619).

43406221 is a wasteful number, since it uses less digits than its factorization.

43406221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43955.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 43406221 is about 6588.3397756946. The cubic root of 43406221 is about 351.4395701668.

Adding to 43406221 its reverse (12260434), we get a palindrome (55666655).

The spelling of 43406221 in words is "forty-three million, four hundred six thousand, two hundred twenty-one".