138626443 has 2 divisors, whose sum is σ = 138626444. Its totient is φ = 138626442.

The previous prime is 138626437. The next prime is 138626473. The reversal of 138626443 is 344626831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138626443 - 2⁹ = 138625931 is a prime.

It is not a weakly prime, because it can be changed into another prime (138626473) 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, 69313221 + 69313222.

It is an arithmetic number, because the mean of its divisors is an integer number (69313222).

Almost surely, 2^138626443 is an apocalyptic number.

138626443 is a deficient number, since it is larger than the sum of its proper divisors (1).

138626443 is an equidigital number, since it uses as much as digits as its factorization.

138626443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 37.

The square root of 138626443 is about 11773.9731187055. The cubic root of 138626443 is about 517.5456864922.

The spelling of 138626443 in words is "one hundred thirty-eight million, six hundred twenty-six thousand, four hundred forty-three".