138824489 has 2 divisors, whose sum is σ = 138824490. Its totient is φ = 138824488.

The previous prime is 138824473. The next prime is 138824501. The reversal of 138824489 is 984428831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114490000 + 24334489 = 10700^2 + 4933^2 .

It is an emirp because it is prime and its reverse (984428831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138824489 - 2⁴ = 138824473 is a prime.

It is a super-2 number, since 2×138824489² = 38544477492222242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138824459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69412244 + 69412245.

It is an arithmetic number, because the mean of its divisors is an integer number (69412245).

Almost surely, 2^138824489 is an apocalyptic number.

It is an amenable number.

138824489 is a deficient number, since it is larger than the sum of its proper divisors (1).

138824489 is an equidigital number, since it uses as much as digits as its factorization.

138824489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 442368, while the sum is 47.

The square root of 138824489 is about 11782.3804470913. The cubic root of 138824489 is about 517.7920297799.

The spelling of 138824489 in words is "one hundred thirty-eight million, eight hundred twenty-four thousand, four hundred eighty-nine".