138656745 has 32 divisors (see below), whose sum is σ = 251164800. Its totient is φ = 72551232.

The previous prime is 138656731. The next prime is 138656753. The reversal of 138656745 is 547656831.

138656745 is a `hidden beast` number, since 1 + 3 + 86 + 567 + 4 + 5 = 666.

It is not a de Polignac number, because 138656745 - 2¹⁰ = 138655721 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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 138656745.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2535 + ... + 16844.

It is an arithmetic number, because the mean of its divisors is an integer number (7848900).

Almost surely, 2^138656745 is an apocalyptic number.

138656745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138656745 is a deficient number, since it is larger than the sum of its proper divisors (112508055).

138656745 is a wasteful number, since it uses less digits than its factorization.

138656745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19446 (or 19440 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 138656745 is about 11775.2598697439. The cubic root of 138656745 is about 517.5833934080.

The spelling of 138656745 in words is "one hundred thirty-eight million, six hundred fifty-six thousand, seven hundred forty-five".