138538850 has 24 divisors (see below), whose sum is σ = 258773988. Its totient is φ = 55180800.

The previous prime is 138538801. The next prime is 138538853. The reversal of 138538850 is 58835831.

It can be written as a sum of positive squares in 6 ways, for example, as 74874409 + 63664441 = 8653^2 + 7979^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138538798 and 138538807.

It is not an unprimeable number, because it can be changed into a prime (138538853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6302 + ... + 17798.

Almost surely, 2^138538850 is an apocalyptic number.

138538850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138538850 is a deficient number, since it is larger than the sum of its proper divisors (120235138).

138538850 is a wasteful number, since it uses less digits than its factorization.

138538850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11750 (or 11745 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 138538850 is about 11770.2527585435. The cubic root of 138538850 is about 517.4366574357.

The spelling of 138538850 in words is "one hundred thirty-eight million, five hundred thirty-eight thousand, eight hundred fifty".