138911112 has 60 divisors (see below), whose sum is σ = 389921895. Its totient is φ = 46203696.

The previous prime is 138911083. The next prime is 138911119. The reversal of 138911112 is 211119831.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 69455556 + 69455556 = 8334^2 + 8334^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8334.

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (138911119) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 299793 + ... + 300255.

Almost surely, 2^138911112 is an apocalyptic number.

138911112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138911112

138911112 is an abundant number, since it is smaller than the sum of its proper divisors (251010783).

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

138911112 is an frugal number, since it uses more digits than its factorization.

138911112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 944 (or 468 counting only the distinct ones).

The product of its digits is 432, while the sum is 27.

The square root of 138911112 is about 11786.0558288174. The cubic root of 138911112 is about 517.8997038019.

The spelling of 138911112 in words is "one hundred thirty-eight million, nine hundred eleven thousand, one hundred twelve".