138222730 has 16 divisors (see below), whose sum is σ = 251004744. Its totient is φ = 54799360.

The previous prime is 138222703. The next prime is 138222731. The reversal of 138222730 is 37222831.

138222730 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 57168721 + 81054009 = 7561^2 + 9003^2 .

It is not an unprimeable number, because it can be changed into a prime (138222731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60031 + ... + 62290.

Almost surely, 2^138222730 is an apocalyptic number.

138222730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138222730 is a deficient number, since it is larger than the sum of its proper divisors (112782014).

138222730 is a wasteful number, since it uses less digits than its factorization.

138222730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122441.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 138222730 is about 11756.8163207562. The cubic root of 138222730 is about 517.0427928318.

The spelling of 138222730 in words is "one hundred thirty-eight million, two hundred twenty-two thousand, seven hundred thirty".