138711645 has 24 divisors (see below), whose sum is σ = 242775936. Its totient is φ = 73258848.

The previous prime is 138711623. The next prime is 138711667. The reversal of 138711645 is 546117831.

138711645 is a `hidden beast` number, since 1 + 3 + 8 + 7 + 1 + 1 + 645 = 666.

It is an interprime number because it is at equal distance from previous prime (138711623) and next prime (138711667).

It is not a de Polignac number, because 138711645 - 2⁶ = 138711581 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10329 + ... + 19598.

It is an arithmetic number, because the mean of its divisors is an integer number (10115664).

Almost surely, 2^138711645 is an apocalyptic number.

138711645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138711645 is a deficient number, since it is larger than the sum of its proper divisors (104064291).

138711645 is a wasteful number, since it uses less digits than its factorization.

138711645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30041 (or 30038 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 138711645 is about 11777.5907977820. The cubic root of 138711645 is about 517.6516953596.

The spelling of 138711645 in words is "one hundred thirty-eight million, seven hundred eleven thousand, six hundred forty-five".