138759919 has 2 divisors, whose sum is σ = 138759920. Its totient is φ = 138759918.

The previous prime is 138759911. The next prime is 138759923. The reversal of 138759919 is 919957831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138759919 - 2³ = 138759911 is a prime.

It is a super-2 number, since 2×138759919² = 38508630241773122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138759911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69379959 + 69379960.

It is an arithmetic number, because the mean of its divisors is an integer number (69379960).

Almost surely, 2^138759919 is an apocalyptic number.

138759919 is a deficient number, since it is larger than the sum of its proper divisors (1).

138759919 is an equidigital number, since it uses as much as digits as its factorization.

138759919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 52.

The square root of 138759919 is about 11779.6400199667. The cubic root of 138759919 is about 517.7117389116.

The spelling of 138759919 in words is "one hundred thirty-eight million, seven hundred fifty-nine thousand, nine hundred nineteen".