138188132 has 12 divisors (see below), whose sum is σ = 250168380. Its totient is φ = 66711456.

The previous prime is 138188123. The next prime is 138188137. The reversal of 138188132 is 231881831.

It can be written as a sum of positive squares in 2 ways, for example, as 108659776 + 29528356 = 10424^2 + 5434^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138188092 and 138188101.

It is not an unprimeable number, because it can be changed into a prime (138188137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 595523 + ... + 595754.

It is an arithmetic number, because the mean of its divisors is an integer number (20847365).

Almost surely, 2^138188132 is an apocalyptic number.

It is an amenable number.

138188132 is a deficient number, since it is larger than the sum of its proper divisors (111980248).

138188132 is a wasteful number, since it uses less digits than its factorization.

138188132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191310 (or 1191308 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 138188132 is about 11755.3448269287. The cubic root of 138188132 is about 516.9996495676. Note that the first 3 decimals are identical.

The spelling of 138188132 in words is "one hundred thirty-eight million, one hundred eighty-eight thousand, one hundred thirty-two".