138403847 has 4 divisors (see below), whose sum is σ = 145688280. Its totient is φ = 131119416.

The previous prime is 138403841. The next prime is 138403873. The reversal of 138403847 is 748304831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138403847 - 2⁸ = 138403591 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 138403847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138403841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3642188 + ... + 3642225.

It is an arithmetic number, because the mean of its divisors is an integer number (36422070).

Almost surely, 2^138403847 is an apocalyptic number.

138403847 is a deficient number, since it is larger than the sum of its proper divisors (7284433).

138403847 is an equidigital number, since it uses as much as digits as its factorization.

138403847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7284432.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 138403847 is about 11764.5164371512. The cubic root of 138403847 is about 517.2685260073.

The spelling of 138403847 in words is "one hundred thirty-eight million, four hundred three thousand, eight hundred forty-seven".