139597673 has 2 divisors, whose sum is σ = 139597674. Its totient is φ = 139597672.

The previous prime is 139597669. The next prime is 139597691. The reversal of 139597673 is 376795931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131515024 + 8082649 = 11468^2 + 2843^2 .

It is a cyclic number.

It is not a de Polignac number, because 139597673 - 2² = 139597669 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (139597643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69798836 + 69798837.

It is an arithmetic number, because the mean of its divisors is an integer number (69798837).

Almost surely, 2^139597673 is an apocalyptic number.

It is an amenable number.

139597673 is a deficient number, since it is larger than the sum of its proper divisors (1).

139597673 is an equidigital number, since it uses as much as digits as its factorization.

139597673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1071630, while the sum is 50.

The square root of 139597673 is about 11815.1459153072. The cubic root of 139597673 is about 518.7515328159.

The spelling of 139597673 in words is "one hundred thirty-nine million, five hundred ninety-seven thousand, six hundred seventy-three".