138744433 has 2 divisors, whose sum is σ = 138744434. Its totient is φ = 138744432.

The previous prime is 138744427. The next prime is 138744469. The reversal of 138744433 is 334447831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129208689 + 9535744 = 11367^2 + 3088^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138744433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138744392 and 138744401.

It is not a weakly prime, because it can be changed into another prime (138744233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69372216 + 69372217.

It is an arithmetic number, because the mean of its divisors is an integer number (69372217).

Almost surely, 2^138744433 is an apocalyptic number.

It is an amenable number.

138744433 is a deficient number, since it is larger than the sum of its proper divisors (1).

138744433 is an equidigital number, since it uses as much as digits as its factorization.

138744433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 37.

The square root of 138744433 is about 11778.9826810298. The cubic root of 138744433 is about 517.6924788296.

The spelling of 138744433 in words is "one hundred thirty-eight million, seven hundred forty-four thousand, four hundred thirty-three".