138982909 has 8 divisors (see below), whose sum is σ = 150436440. Its totient is φ = 127638336.

The previous prime is 138982897. The next prime is 138982913. The reversal of 138982909 is 909289831.

It can be written as a sum of positive squares in 4 ways, for example, as 64850809 + 74132100 = 8053^2 + 8610^2 .

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 138982909 - 2¹¹ = 138980861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138982999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24574 + ... + 29695.

It is an arithmetic number, because the mean of its divisors is an integer number (18804555).

Almost surely, 2^138982909 is an apocalyptic number.

It is an amenable number.

138982909 is a deficient number, since it is larger than the sum of its proper divisors (11453531).

138982909 is a wasteful number, since it uses less digits than its factorization.

138982909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54479.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 138982909 is about 11789.1012804200. The cubic root of 138982909 is about 517.9889149052.

It can be divided in two parts, 13898 and 2909, that added together give a 5-th power (16807 = 7⁵).

The spelling of 138982909 in words is "one hundred thirty-eight million, nine hundred eighty-two thousand, nine hundred nine".