138774222 has 80 divisors (see below), whose sum is σ = 325828800. Its totient is φ = 44089920.

The previous prime is 138774191. The next prime is 138774227. The reversal of 138774222 is 222477831.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138774227) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 511947 + ... + 512217.

It is an arithmetic number, because the mean of its divisors is an integer number (4072860).

Almost surely, 2^138774222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138774222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162914400).

138774222 is an abundant number, since it is smaller than the sum of its proper divisors (187054578).

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

138774222 is a wasteful number, since it uses less digits than its factorization.

138774222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 414 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 138774222 is about 11780.2471111603. The cubic root of 138774222 is about 517.7295264126.

The spelling of 138774222 in words is "one hundred thirty-eight million, seven hundred seventy-four thousand, two hundred twenty-two".