138690045 has 48 divisors (see below), whose sum is σ = 259983360. Its totient is φ = 67989888.

The previous prime is 138690037. The next prime is 138690047. The reversal of 138690045 is 540096831.

It is not a de Polignac number, because 138690045 - 2³ = 138690037 is a prime.

Together with 121293315 it forms an amicable pair .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138689991 and 138690009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138690047) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 223746 + ... + 224364.

It is an arithmetic number, because the mean of its divisors is an integer number (5416320).

Almost surely, 2^138690045 is an apocalyptic number.

138690045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138690045 is a deficient number, since it is larger than the sum of its proper divisors (121293315).

138690045 is a wasteful number, since it uses less digits than its factorization.

138690045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026 (or 1023 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 138690045 is about 11776.6737663909. The cubic root of 138690045 is about 517.6248246114.

It can be divided in two parts, 1386900 and 45, that added together give a triangular number (1386945 = T₁₆₆₅).

The spelling of 138690045 in words is "one hundred thirty-eight million, six hundred ninety thousand, forty-five".