138176685 has 40 divisors (see below), whose sum is σ = 254416536. Its totient is φ = 71694720.

The previous prime is 138176669. The next prime is 138176699. The reversal of 138176685 is 586671831.

It can be written as a sum of positive squares in 4 ways, for example, as 70509609 + 67667076 = 8397^2 + 8226^2 .

It is not a de Polignac number, because 138176685 - 2⁴ = 138176669 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 138176685.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 10375 + ... + 19595.

Almost surely, 2^138176685 is an apocalyptic number.

138176685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138176685 is a deficient number, since it is larger than the sum of its proper divisors (116239851).

138176685 is an equidigital number, since it uses as much as digits as its factorization.

138176685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9275 (or 9266 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 138176685 is about 11754.8579319361. The cubic root of 138176685 is about 516.9853737193.

It can be divided in two parts, 13817 and 6685, that added together give a palindrome (20502).

The spelling of 138176685 in words is "one hundred thirty-eight million, one hundred seventy-six thousand, six hundred eighty-five".