138222793 has 4 divisors (see below), whose sum is σ = 138343828. Its totient is φ = 138101760.

The previous prime is 138222779. The next prime is 138222827. The reversal of 138222793 is 397222831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 397222831 = 29 ⋅13697339.

It can be written as a sum of positive squares in 2 ways, for example, as 116057529 + 22165264 = 10773^2 + 4708^2 .

It is a cyclic number.

It is not a de Polignac number, because 138222793 - 2⁵ = 138222761 is a prime.

It is a super-3 number, since 3×138222793³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138222703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58788 + ... + 61093.

It is an arithmetic number, because the mean of its divisors is an integer number (34585957).

Almost surely, 2^138222793 is an apocalyptic number.

It is an amenable number.

138222793 is a deficient number, since it is larger than the sum of its proper divisors (121035).

138222793 is a wasteful number, since it uses less digits than its factorization.

138222793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121034.

The product of its digits is 36288, while the sum is 37.

The square root of 138222793 is about 11756.8190000527. The cubic root of 138222793 is about 517.0428713855.

The spelling of 138222793 in words is "one hundred thirty-eight million, two hundred twenty-two thousand, seven hundred ninety-three".