139393697 has 2 divisors, whose sum is σ = 139393698. Its totient is φ = 139393696.

The previous prime is 139393679. The next prime is 139393721. The reversal of 139393697 is 796393931.

It is a happy number.

139393697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (139393679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138391696 + 1002001 = 11764^2 + 1001^2 .

It is a cyclic number.

It is not a de Polignac number, because 139393697 - 2¹⁴ = 139377313 is a prime.

It is not a weakly prime, because it can be changed into another prime (139393607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69696848 + 69696849.

It is an arithmetic number, because the mean of its divisors is an integer number (69696849).

Almost surely, 2^139393697 is an apocalyptic number.

It is an amenable number.

139393697 is a deficient number, since it is larger than the sum of its proper divisors (1).

139393697 is an equidigital number, since it uses as much as digits as its factorization.

139393697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 826686, while the sum is 50.

The square root of 139393697 is about 11806.5107885438. The cubic root of 139393697 is about 518.4987481786.

The spelling of 139393697 in words is "one hundred thirty-nine million, three hundred ninety-three thousand, six hundred ninety-seven".