43213979 has 2 divisors, whose sum is σ = 43213980. Its totient is φ = 43213978.

The previous prime is 43213957. The next prime is 43213981. The reversal of 43213979 is 97931234.

43213979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43213979 is a prime.

Together with 43213981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43213579) 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 as a sum of consecutive naturals, namely, 21606989 + 21606990.

It is an arithmetic number, because the mean of its divisors is an integer number (21606990).

Almost surely, 2^43213979 is an apocalyptic number.

43213979 is a deficient number, since it is larger than the sum of its proper divisors (1).

43213979 is an equidigital number, since it uses as much as digits as its factorization.

43213979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 38.

The square root of 43213979 is about 6573.7340226085. The cubic root of 43213979 is about 350.9199715817.

The spelling of 43213979 in words is "forty-three million, two hundred thirteen thousand, nine hundred seventy-nine".