138817403 has 4 divisors (see below), whose sum is σ = 143604240. Its totient is φ = 134030568.

The previous prime is 138817391. The next prime is 138817421. The reversal of 138817403 is 304718831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304718831 = 5507 ⋅55333.

It is a cyclic number.

It is not a de Polignac number, because 138817403 - 2⁴ = 138817387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138817423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2393375 + ... + 2393432.

It is an arithmetic number, because the mean of its divisors is an integer number (35901060).

Almost surely, 2^138817403 is an apocalyptic number.

138817403 is a deficient number, since it is larger than the sum of its proper divisors (4786837).

138817403 is an equidigital number, since it uses as much as digits as its factorization.

138817403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4786836.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 138817403 is about 11782.0797400119. The cubic root of 138817403 is about 517.7832197667.

The spelling of 138817403 in words is "one hundred thirty-eight million, eight hundred seventeen thousand, four hundred three".