43213423 has 4 divisors (see below), whose sum is σ = 47141928. Its totient is φ = 39284920.

The previous prime is 43213399. The next prime is 43213441. The reversal of 43213423 is 32431234.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43213423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43213394 and 43213403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43213453) 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, 1964236 + ... + 1964257.

It is an arithmetic number, because the mean of its divisors is an integer number (11785482).

Almost surely, 2^43213423 is an apocalyptic number.

43213423 is a deficient number, since it is larger than the sum of its proper divisors (3928505).

43213423 is a wasteful number, since it uses less digits than its factorization.

43213423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928504.

The product of its digits is 1728, while the sum is 22.

The square root of 43213423 is about 6573.6917329610. The cubic root of 43213423 is about 350.9184665723.

Adding to 43213423 its reverse (32431234), we get a palindrome (75644657).

It can be divided in two parts, 4321 and 3423, that added together give a square (7744 = 88²).

The spelling of 43213423 in words is "forty-three million, two hundred thirteen thousand, four hundred twenty-three".