138810120 has 32 divisors (see below), whose sum is σ = 416430720. Its totient is φ = 37016000.

The previous prime is 138810109. The next prime is 138810121. The reversal of 138810120 is 21018831.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (138810121) 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, 578256 + ... + 578495.

It is an arithmetic number, because the mean of its divisors is an integer number (13013460).

Almost surely, 2^138810120 is an apocalyptic number.

138810120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138810120 is an abundant number, since it is smaller than the sum of its proper divisors (277620600).

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

138810120 is a wasteful number, since it uses less digits than its factorization.

138810120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156765 (or 1156761 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 138810120 is about 11781.7706648873. The cubic root of 138810120 is about 517.7741645112.

Adding to 138810120 its reverse (21018831), we get a palindrome (159828951).

The spelling of 138810120 in words is "one hundred thirty-eight million, eight hundred ten thousand, one hundred twenty".