138367785 has 32 divisors (see below), whose sum is σ = 233976960. Its totient is φ = 69631488.

The previous prime is 138367781. The next prime is 138367829. The reversal of 138367785 is 587763831.

138367785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138367785 - 2² = 138367781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138367781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82677 + ... + 84333.

It is an arithmetic number, because the mean of its divisors is an integer number (7311780).

Almost surely, 2^138367785 is an apocalyptic number.

138367785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138367785 is a deficient number, since it is larger than the sum of its proper divisors (95609175).

138367785 is a wasteful number, since it uses less digits than its factorization.

138367785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977.

The product of its digits is 846720, while the sum is 48.

The square root of 138367785 is about 11762.9836776219. The cubic root of 138367785 is about 517.2235962400.

The spelling of 138367785 in words is "one hundred thirty-eight million, three hundred sixty-seven thousand, seven hundred eighty-five".