43212139 has 2 divisors, whose sum is σ = 43212140. Its totient is φ = 43212138.

The previous prime is 43212097. The next prime is 43212151. The reversal of 43212139 is 93121234.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43212139 - 2⁹ = 43211627 is a prime.

It is not a weakly prime, because it can be changed into another prime (43212179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21606069 + 21606070.

It is an arithmetic number, because the mean of its divisors is an integer number (21606070).

Almost surely, 2^43212139 is an apocalyptic number.

43212139 is a deficient number, since it is larger than the sum of its proper divisors (1).

43212139 is an equidigital number, since it uses as much as digits as its factorization.

43212139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 43212139 is about 6573.5940702176. The cubic root of 43212139 is about 350.9149909256.

The spelling of 43212139 in words is "forty-three million, two hundred twelve thousand, one hundred thirty-nine".