138974057 has 2 divisors, whose sum is σ = 138974058. Its totient is φ = 138974056.

The previous prime is 138974053. The next prime is 138974093. The reversal of 138974057 is 750479831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90935296 + 48038761 = 9536^2 + 6931^2 .

It is an emirp because it is prime and its reverse (750479831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138974057 - 2² = 138974053 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 138973999 and 138974017.

It is not a weakly prime, because it can be changed into another prime (138974053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69487028 + 69487029.

It is an arithmetic number, because the mean of its divisors is an integer number (69487029).

Almost surely, 2^138974057 is an apocalyptic number.

It is an amenable number.

138974057 is a deficient number, since it is larger than the sum of its proper divisors (1).

138974057 is an equidigital number, since it uses as much as digits as its factorization.

138974057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 138974057 is about 11788.7258429399. The cubic root of 138974057 is about 517.9779175452.

The spelling of 138974057 in words is "one hundred thirty-eight million, nine hundred seventy-four thousand, fifty-seven".