138424222 has 4 divisors (see below), whose sum is σ = 207636336. Its totient is φ = 69212110.

The previous prime is 138424171. The next prime is 138424261. The reversal of 138424222 is 222424831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 222424831 = 607 ⋅366433.

It is a super-2 number, since 2×138424222² = 38322530472610568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34606054 + ... + 34606057.

It is an arithmetic number, because the mean of its divisors is an integer number (51909084).

Almost surely, 2^138424222 is an apocalyptic number.

138424222 is a deficient number, since it is larger than the sum of its proper divisors (69212114).

138424222 is an equidigital number, since it uses as much as digits as its factorization.

138424222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69212113.

The product of its digits is 6144, while the sum is 28.

The square root of 138424222 is about 11765.3823567277. The cubic root of 138424222 is about 517.2939078381.

The spelling of 138424222 in words is "one hundred thirty-eight million, four hundred twenty-four thousand, two hundred twenty-two".