138425184 has 144 divisors (see below), whose sum is σ = 425159280. Its totient is φ = 42577920.

The previous prime is 138425141. The next prime is 138425219. The reversal of 138425184 is 481524831.

138425184 is a `hidden beast` number, since 138 + 4 + 2 + 518 + 4 = 666.

138425184 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 224044 + ... + 224660.

It is an arithmetic number, because the mean of its divisors is an integer number (2952495).

Almost surely, 2^138425184 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138425184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212579640).

138425184 is an abundant number, since it is smaller than the sum of its proper divisors (286734096).

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

138425184 is a wasteful number, since it uses less digits than its factorization.

138425184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 682 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 138425184 is about 11765.4232393059. The cubic root of 138425184 is about 517.2951061727.

The spelling of 138425184 in words is "one hundred thirty-eight million, four hundred twenty-five thousand, one hundred eighty-four".