43722139 has 2 divisors, whose sum is σ = 43722140. Its totient is φ = 43722138.

The previous prime is 43722101. The next prime is 43722187. The reversal of 43722139 is 93122734.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43722139 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43722139.

It is not a weakly prime, because it can be changed into another prime (43722199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21861069 + 21861070.

It is an arithmetic number, because the mean of its divisors is an integer number (21861070).

Almost surely, 2^43722139 is an apocalyptic number.

43722139 is a deficient number, since it is larger than the sum of its proper divisors (1).

43722139 is an equidigital number, since it uses as much as digits as its factorization.

43722139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 31.

The square root of 43722139 is about 6612.2718486160. The cubic root of 43722139 is about 352.2901227047.

The spelling of 43722139 in words is "forty-three million, seven hundred twenty-two thousand, one hundred thirty-nine".