138066403 has 2 divisors, whose sum is σ = 138066404. Its totient is φ = 138066402.

The previous prime is 138066391. The next prime is 138066413. The reversal of 138066403 is 304660831.

It is a strong prime.

It is an emirp because it is prime and its reverse (304660831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138066403 - 2⁵ = 138066371 is a prime.

It is not a weakly prime, because it can be changed into another prime (138066413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69033201 + 69033202.

It is an arithmetic number, because the mean of its divisors is an integer number (69033202).

Almost surely, 2^138066403 is an apocalyptic number.

138066403 is a deficient number, since it is larger than the sum of its proper divisors (1).

138066403 is an equidigital number, since it uses as much as digits as its factorization.

138066403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 138066403 is about 11750.1660839326. The cubic root of 138066403 is about 516.8477977942.

The spelling of 138066403 in words is "one hundred thirty-eight million, sixty-six thousand, four hundred three".