139847857 has 2 divisors, whose sum is σ = 139847858. Its totient is φ = 139847856.

The previous prime is 139847839. The next prime is 139847861. The reversal of 139847857 is 758748931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109641841 + 30206016 = 10471^2 + 5496^2 .

It is a cyclic number.

It is not a de Polignac number, because 139847857 - 2²⁷ = 5630129 is a prime.

It is not a weakly prime, because it can be changed into another prime (139847887) 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, 69923928 + 69923929.

It is an arithmetic number, because the mean of its divisors is an integer number (69923929).

Almost surely, 2^139847857 is an apocalyptic number.

It is an amenable number.

139847857 is a deficient number, since it is larger than the sum of its proper divisors (1).

139847857 is an equidigital number, since it uses as much as digits as its factorization.

139847857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 52.

The square root of 139847857 is about 11825.7286033462. The cubic root of 139847857 is about 519.0612463810.

The spelling of 139847857 in words is "one hundred thirty-nine million, eight hundred forty-seven thousand, eight hundred fifty-seven".