138774221 has 8 divisors (see below), whose sum is σ = 141965184. Its totient is φ = 135593280.

The previous prime is 138774191. The next prime is 138774227. The reversal of 138774221 is 122477831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138774221 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 30341 + ... + 34613.

It is an arithmetic number, because the mean of its divisors is an integer number (17745648).

Almost surely, 2^138774221 is an apocalyptic number.

It is an amenable number.

138774221 is a deficient number, since it is larger than the sum of its proper divisors (3190963).

138774221 is an equidigital number, since it uses as much as digits as its factorization.

138774221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011.

The product of its digits is 18816, while the sum is 35.

The square root of 138774221 is about 11780.2470687163. The cubic root of 138774221 is about 517.7295251690.

The spelling of 138774221 in words is "one hundred thirty-eight million, seven hundred seventy-four thousand, two hundred twenty-one".