138783693 has 4 divisors (see below), whose sum is σ = 185044928. Its totient is φ = 92522460.

The previous prime is 138783653. The next prime is 138783703. The reversal of 138783693 is 396387831.

138783693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-138783693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138783613) 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, 23130613 + ... + 23130618.

It is an arithmetic number, because the mean of its divisors is an integer number (46261232).

Almost surely, 2^138783693 is an apocalyptic number.

It is an amenable number.

138783693 is a deficient number, since it is larger than the sum of its proper divisors (46261235).

138783693 is an equidigital number, since it uses as much as digits as its factorization.

138783693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46261234.

The product of its digits is 653184, while the sum is 48.

The square root of 138783693 is about 11780.6490907759. The cubic root of 138783693 is about 517.7413040678.

It can be divided in two parts, 13878 and 3693, that added together give a palindrome (17571).

The spelling of 138783693 in words is "one hundred thirty-eight million, seven hundred eighty-three thousand, six hundred ninety-three".