138432643 has 2 divisors, whose sum is σ = 138432644. Its totient is φ = 138432642.

The previous prime is 138432611. The next prime is 138432659. The reversal of 138432643 is 346234831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138432643 - 2⁵ = 138432611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138432599 and 138432608.

It is not a weakly prime, because it can be changed into another prime (138432443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69216321 + 69216322.

It is an arithmetic number, because the mean of its divisors is an integer number (69216322).

Almost surely, 2^138432643 is an apocalyptic number.

138432643 is a deficient number, since it is larger than the sum of its proper divisors (1).

138432643 is an equidigital number, since it uses as much as digits as its factorization.

138432643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 34.

The square root of 138432643 is about 11765.7402232074. The cubic root of 138432643 is about 517.3043974369.

The spelling of 138432643 in words is "one hundred thirty-eight million, four hundred thirty-two thousand, six hundred forty-three".