139806971 has 2 divisors, whose sum is σ = 139806972. Its totient is φ = 139806970.

The previous prime is 139806923. The next prime is 139807021. The reversal of 139806971 is 179608931.

139806971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139806971 - 2⁶ = 139806907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139806371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69903485 + 69903486.

It is an arithmetic number, because the mean of its divisors is an integer number (69903486).

Almost surely, 2^139806971 is an apocalyptic number.

139806971 is a deficient number, since it is larger than the sum of its proper divisors (1).

139806971 is an equidigital number, since it uses as much as digits as its factorization.

139806971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 139806971 is about 11823.9997885656. Note that the first 3 decimals coincide. The cubic root of 139806971 is about 519.0106571023.

The spelling of 139806971 in words is "one hundred thirty-nine million, eight hundred six thousand, nine hundred seventy-one".