138838020 has 24 divisors (see below), whose sum is σ = 388746624. Its totient is φ = 37023456.

The previous prime is 138838009. The next prime is 138838027. The reversal of 138838020 is 20838831.

It is not an unprimeable number, because it can be changed into a prime (138838027) 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, 1156924 + ... + 1157043.

It is an arithmetic number, because the mean of its divisors is an integer number (16197776).

Almost surely, 2^138838020 is an apocalyptic number.

138838020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138838020 is an abundant number, since it is smaller than the sum of its proper divisors (249908604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138838020 is a wasteful number, since it uses less digits than its factorization.

138838020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313979 (or 2313977 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 138838020 is about 11782.9546379505. The cubic root of 138838020 is about 517.8088520192.

The spelling of 138838020 in words is "one hundred thirty-eight million, eight hundred thirty-eight thousand, twenty".