138137639 has 2 divisors, whose sum is σ = 138137640. Its totient is φ = 138137638.

The previous prime is 138137621. The next prime is 138137689. The reversal of 138137639 is 936731831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138137639 - 2⁸ = 138137383 is a prime.

It is equal to p_7812788 and since 138137639 and 7812788 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 138137596 and 138137605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138137689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69068819 + 69068820.

It is an arithmetic number, because the mean of its divisors is an integer number (69068820).

Almost surely, 2^138137639 is an apocalyptic number.

138137639 is a deficient number, since it is larger than the sum of its proper divisors (1).

138137639 is an equidigital number, since it uses as much as digits as its factorization.

138137639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 138137639 is about 11753.1969693356. The cubic root of 138137639 is about 516.9366725157.

The spelling of 138137639 in words is "one hundred thirty-eight million, one hundred thirty-seven thousand, six hundred thirty-nine".