139686923 has 2 divisors, whose sum is σ = 139686924. Its totient is φ = 139686922.

The previous prime is 139686907. The next prime is 139687007. The reversal of 139686923 is 329686931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139686923 - 2⁴ = 139686907 is a prime.

It is not a weakly prime, because it can be changed into another prime (139686623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69843461 + 69843462.

It is an arithmetic number, because the mean of its divisors is an integer number (69843462).

Almost surely, 2^139686923 is an apocalyptic number.

139686923 is a deficient number, since it is larger than the sum of its proper divisors (1).

139686923 is an equidigital number, since it uses as much as digits as its factorization.

139686923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 47.

The square root of 139686923 is about 11818.9222435889. The cubic root of 139686923 is about 518.8620616665.

The spelling of 139686923 in words is "one hundred thirty-nine million, six hundred eighty-six thousand, nine hundred twenty-three".