138838845 has 16 divisors (see below), whose sum is σ = 222546240. Its totient is φ = 73912704.

The previous prime is 138838841. The next prime is 138838877. The reversal of 138838845 is 548838831.

It is not a de Polignac number, because 138838845 - 2² = 138838841 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138838794 and 138838803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138838841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402 + ... + 16668.

It is an arithmetic number, because the mean of its divisors is an integer number (13909140).

Almost surely, 2^138838845 is an apocalyptic number.

138838845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138838845 is a deficient number, since it is larger than the sum of its proper divisors (83707395).

138838845 is a wasteful number, since it uses less digits than its factorization.

138838845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16844.

The product of its digits is 737280, while the sum is 48.

The square root of 138838845 is about 11782.9896460958. The cubic root of 138838845 is about 517.8098776544.

The spelling of 138838845 in words is "one hundred thirty-eight million, eight hundred thirty-eight thousand, eight hundred forty-five".