43664213 has 4 divisors (see below), whose sum is σ = 45072768. Its totient is φ = 42255660.

The previous prime is 43664207. The next prime is 43664233. The reversal of 43664213 is 31246634.

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.

It is a cyclic number.

It is not a de Polignac number, because 43664213 - 2⁴ = 43664197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43664233) 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, 704231 + ... + 704292.

It is an arithmetic number, because the mean of its divisors is an integer number (11268192).

Almost surely, 2^43664213 is an apocalyptic number.

It is an amenable number.

43664213 is a deficient number, since it is larger than the sum of its proper divisors (1408555).

43664213 is a wasteful number, since it uses less digits than its factorization.

43664213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408554.

The product of its digits is 10368, while the sum is 29.

The square root of 43664213 is about 6607.8902079257. The cubic root of 43664213 is about 352.1344748123.

The spelling of 43664213 in words is "forty-three million, six hundred sixty-four thousand, two hundred thirteen".