138427403 has 4 divisors (see below), whose sum is σ = 139437960. Its totient is φ = 137416848.

The previous prime is 138427391. The next prime is 138427417. The reversal of 138427403 is 304724831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304724831 = 19 ⋅16038149.

It is a cyclic number.

It is not a de Polignac number, because 138427403 - 2²⁰ = 137378827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138427403.

It is not an unprimeable number, because it can be changed into a prime (138427433) 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, 505073 + ... + 505346.

It is an arithmetic number, because the mean of its divisors is an integer number (34859490).

Almost surely, 2^138427403 is an apocalyptic number.

138427403 is a deficient number, since it is larger than the sum of its proper divisors (1010557).

138427403 is a wasteful number, since it uses less digits than its factorization.

138427403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010556.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 138427403 is about 11765.5175406779. The cubic root of 138427403 is about 517.2978702933.

The spelling of 138427403 in words is "one hundred thirty-eight million, four hundred twenty-seven thousand, four hundred three".