138444120 has 64 divisors (see below), whose sum is σ = 461484000. Its totient is φ = 36918144.

The previous prime is 138444091. The next prime is 138444143. The reversal of 138444120 is 21444831.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63015 + ... + 65174.

Almost surely, 2^138444120 is an apocalyptic number.

138444120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138444120 is an abundant number, since it is smaller than the sum of its proper divisors (323039880).

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

138444120 is a wasteful number, since it uses less digits than its factorization.

138444120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128209 (or 128199 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 138444120 is about 11766.2279427181. The cubic root of 138444120 is about 517.3186930500.

Adding to 138444120 its reverse (21444831), we get a palindrome (159888951).

The spelling of 138444120 in words is "one hundred thirty-eight million, four hundred forty-four thousand, one hundred twenty".