138215066 has 32 divisors (see below), whose sum is σ = 241911360. Its totient is φ = 58528000.

The previous prime is 138215041. The next prime is 138215069. The reversal of 138215066 is 660512831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138215069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35945 + ... + 39603.

It is an arithmetic number, because the mean of its divisors is an integer number (7559730).

Almost surely, 2^138215066 is an apocalyptic number.

138215066 is a deficient number, since it is larger than the sum of its proper divisors (103696294).

138215066 is a wasteful number, since it uses less digits than its factorization.

138215066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3790.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 138215066 is about 11756.4903776595. The cubic root of 138215066 is about 517.0332365425.

Adding to 138215066 its reverse (660512831), we get a palindrome (798727897).

The spelling of 138215066 in words is "one hundred thirty-eight million, two hundred fifteen thousand, sixty-six".