139738999 has 2 divisors, whose sum is σ = 139739000. Its totient is φ = 139738998.

The previous prime is 139738993. The next prime is 139739011. The reversal of 139738999 is 999837931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139738999 - 2¹¹ = 139736951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139738993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69869499 + 69869500.

It is an arithmetic number, because the mean of its divisors is an integer number (69869500).

Almost surely, 2^139738999 is an apocalyptic number.

139738999 is a deficient number, since it is larger than the sum of its proper divisors (1).

139738999 is an equidigital number, since it uses as much as digits as its factorization.

139738999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3306744, while the sum is 58.

The square root of 139738999 is about 11821.1251156563. The cubic root of 139738999 is about 518.9265317998.

The spelling of 139738999 in words is "one hundred thirty-nine million, seven hundred thirty-eight thousand, nine hundred ninety-nine".