840063139 has 2 divisors, whose sum is σ = 840063140. Its totient is φ = 840063138.

The previous prime is 840063083. The next prime is 840063149. The reversal of 840063139 is 931360048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840063139 - 2¹¹ = 840061091 is a prime.

It is not a weakly prime, because it can be changed into another prime (840063149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420031569 + 420031570.

It is an arithmetic number, because the mean of its divisors is an integer number (420031570).

Almost surely, 2^840063139 is an apocalyptic number.

840063139 is a deficient number, since it is larger than the sum of its proper divisors (1).

840063139 is an equidigital number, since it uses as much as digits as its factorization.

840063139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 840063139 is about 28983.8427231449. The cubic root of 840063139 is about 943.5624359853.

The spelling of 840063139 in words is "eight hundred forty million, sixty-three thousand, one hundred thirty-nine".