43218401 has 4 divisors (see below), whose sum is σ = 43241904. Its totient is φ = 43194900.

The previous prime is 43218389. The next prime is 43218421. The reversal of 43218401 is 10481234.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10481234 = 2 ⋅5240617.

It is a cyclic number.

It is not a de Polignac number, because 43218401 - 2⁶ = 43218337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43218421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8735 + ... + 12756.

It is an arithmetic number, because the mean of its divisors is an integer number (10810476).

Almost surely, 2^43218401 is an apocalyptic number.

It is an amenable number.

43218401 is a deficient number, since it is larger than the sum of its proper divisors (23503).

43218401 is a wasteful number, since it uses less digits than its factorization.

43218401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23502.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 43218401 is about 6574.0703525289. The cubic root of 43218401 is about 350.9319408196.

Adding to 43218401 its reverse (10481234), we get a palindrome (53699635).

The spelling of 43218401 in words is "forty-three million, two hundred eighteen thousand, four hundred one".