43406321 has 8 divisors (see below), whose sum is σ = 52525440. Its totient is φ = 35016768.

The previous prime is 43406273. The next prime is 43406323. The reversal of 43406321 is 12360434.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43406321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43406323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182261 + ... + 182498.

It is an arithmetic number, because the mean of its divisors is an integer number (6565680).

Almost surely, 2^43406321 is an apocalyptic number.

It is an amenable number.

43406321 is a deficient number, since it is larger than the sum of its proper divisors (9119119).

43406321 is a wasteful number, since it uses less digits than its factorization.

43406321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364783.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 43406321 is about 6588.3473648556. The cubic root of 43406321 is about 351.4398400508.

Adding to 43406321 its reverse (12360434), we get a palindrome (55766755).

The spelling of 43406321 in words is "forty-three million, four hundred six thousand, three hundred twenty-one".