138112785 has 12 divisors (see below), whose sum is σ = 239395572. Its totient is φ = 73660128.

The previous prime is 138112783. The next prime is 138112787. The reversal of 138112785 is 587211831.

138112785 is a `hidden beast` number, since 1 + 381 + 1 + 278 + 5 = 666.

138112785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (138112783) and next prime (138112787).

It can be written as a sum of positive squares in 2 ways, for example, as 86099841 + 52012944 = 9279^2 + 7212^2 .

It is not a de Polignac number, because 138112785 - 2¹ = 138112783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138112783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1534542 + ... + 1534631.

It is an arithmetic number, because the mean of its divisors is an integer number (19949631).

Almost surely, 2^138112785 is an apocalyptic number.

138112785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138112785 is a deficient number, since it is larger than the sum of its proper divisors (101282787).

138112785 is a wasteful number, since it uses less digits than its factorization.

138112785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3069184 (or 3069181 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 138112785 is about 11752.1395924317. The cubic root of 138112785 is about 516.9056678965.

The spelling of 138112785 in words is "one hundred thirty-eight million, one hundred twelve thousand, seven hundred eighty-five".