138126403 has 2 divisors, whose sum is σ = 138126404. Its totient is φ = 138126402.

The previous prime is 138126397. The next prime is 138126413. The reversal of 138126403 is 304621831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138126403 - 2²¹ = 136029251 is a prime.

It is not a weakly prime, because it can be changed into another prime (138126413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69063201 + 69063202.

It is an arithmetic number, because the mean of its divisors is an integer number (69063202).

Almost surely, 2^138126403 is an apocalyptic number.

138126403 is a deficient number, since it is larger than the sum of its proper divisors (1).

138126403 is an equidigital number, since it uses as much as digits as its factorization.

138126403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 138126403 is about 11752.7189620105. The cubic root of 138126403 is about 516.9226564035.

The spelling of 138126403 in words is "one hundred thirty-eight million, one hundred twenty-six thousand, four hundred three".