139689889 has 2 divisors, whose sum is σ = 139689890. Its totient is φ = 139689888.

The previous prime is 139689887. The next prime is 139689917. The reversal of 139689889 is 988986931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139641489 + 48400 = 11817^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 139689889 - 2¹ = 139689887 is a prime.

Together with 139689887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (139689883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69844944 + 69844945.

It is an arithmetic number, because the mean of its divisors is an integer number (69844945).

Almost surely, 2^139689889 is an apocalyptic number.

It is an amenable number.

139689889 is a deficient number, since it is larger than the sum of its proper divisors (1).

139689889 is an equidigital number, since it uses as much as digits as its factorization.

139689889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6718464, while the sum is 61.

The square root of 139689889 is about 11819.0477196769. The cubic root of 139689889 is about 518.8657340073.

The spelling of 139689889 in words is "one hundred thirty-nine million, six hundred eighty-nine thousand, eight hundred eighty-nine".