138188196 has 18 divisors (see below), whose sum is σ = 349309142. Its totient is φ = 46062720.

The previous prime is 138188191. The next prime is 138188221. The reversal of 138188196 is 691881831.

138188196 is a `hidden beast` number, since 1 + 381 + 88 + 196 = 666.

It can be written as a sum of positive squares in only one way, i.e., 106378596 + 31809600 = 10314^2 + 5640^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (138188191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1919245 + ... + 1919316.

Almost surely, 2^138188196 is an apocalyptic number.

It is an amenable number.

138188196 is an abundant number, since it is smaller than the sum of its proper divisors (211120946).

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

138188196 is a wasteful number, since it uses less digits than its factorization.

138188196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3838571 (or 3838566 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 138188196 is about 11755.3475490944. The cubic root of 138188196 is about 516.9997293814. Note that the first 3 decimals are identical.

It can be divided in two parts, 138188 and 196, that added together give a square (138384 = 372²).

The spelling of 138188196 in words is "one hundred thirty-eight million, one hundred eighty-eight thousand, one hundred ninety-six".