139027897 has 2 divisors, whose sum is σ = 139027898. Its totient is φ = 139027896.

The previous prime is 139027891. The next prime is 139027949. The reversal of 139027897 is 798720931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69622336 + 69405561 = 8344^2 + 8331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139027897 is a prime.

It is a super-2 number, since 2×139027897² = 38657512288485218, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139027891) 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, 69513948 + 69513949.

It is an arithmetic number, because the mean of its divisors is an integer number (69513949).

Almost surely, 2^139027897 is an apocalyptic number.

It is an amenable number.

139027897 is a deficient number, since it is larger than the sum of its proper divisors (1).

139027897 is an equidigital number, since it uses as much as digits as its factorization.

139027897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 139027897 is about 11791.0091595249. The cubic root of 139027897 is about 518.0447989261.

The spelling of 139027897 in words is "one hundred thirty-nine million, twenty-seven thousand, eight hundred ninety-seven".