138756945 has 8 divisors (see below), whose sum is σ = 222011136. Its totient is φ = 74003696.

The previous prime is 138756913. The next prime is 138756979. The reversal of 138756945 is 549657831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138756945 - 2⁵ = 138756913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138756894 and 138756903.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4625217 + ... + 4625246.

It is an arithmetic number, because the mean of its divisors is an integer number (27751392).

Almost surely, 2^138756945 is an apocalyptic number.

138756945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138756945 is a deficient number, since it is larger than the sum of its proper divisors (83254191).

138756945 is an equidigital number, since it uses as much as digits as its factorization.

138756945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9250471.

The product of its digits is 907200, while the sum is 48.

The square root of 138756945 is about 11779.5137845329. The cubic root of 138756945 is about 517.7080402314.

The spelling of 138756945 in words is "one hundred thirty-eight million, seven hundred fifty-six thousand, nine hundred forty-five".