138551218 has 32 divisors (see below), whose sum is σ = 239283072. Its totient is φ = 59664000.

The previous prime is 138551213. The next prime is 138551219. The reversal of 138551218 is 812155831.

It is not an unprimeable number, because it can be changed into a prime (138551213) 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, 21693 + ... + 27343.

It is an arithmetic number, because the mean of its divisors is an integer number (7477596).

Almost surely, 2^138551218 is an apocalyptic number.

138551218 is a deficient number, since it is larger than the sum of its proper divisors (100731854).

138551218 is a wasteful number, since it uses less digits than its factorization.

138551218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5730.

The product of its digits is 9600, while the sum is 34.

The square root of 138551218 is about 11770.7781391036. The cubic root of 138551218 is about 517.4520549606.

The spelling of 138551218 in words is "one hundred thirty-eight million, five hundred fifty-one thousand, two hundred eighteen".