39222181 has 4 divisors (see below), whose sum is σ = 40574700. Its totient is φ = 37869664.

The previous prime is 39222167. The next prime is 39222203. The reversal of 39222181 is 18122293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18122293 = 7 ⋅2588899.

It can be written as a sum of positive squares in 2 ways, for example, as 31741956 + 7480225 = 5634^2 + 2735^2 .

It is a cyclic number.

It is not a de Polignac number, because 39222181 - 2¹⁵ = 39189413 is a prime.

It is a super-2 number, since 2×39222181² = 3076758964793522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39222151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 676216 + ... + 676273.

It is an arithmetic number, because the mean of its divisors is an integer number (10143675).

Almost surely, 2^39222181 is an apocalyptic number.

It is an amenable number.

39222181 is a deficient number, since it is larger than the sum of its proper divisors (1352519).

39222181 is a wasteful number, since it uses less digits than its factorization.

39222181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352518.

The product of its digits is 1728, while the sum is 28.

The square root of 39222181 is about 6262.7614516282. The cubic root of 39222181 is about 339.7639104964.

The spelling of 39222181 in words is "thirty-nine million, two hundred twenty-two thousand, one hundred eighty-one".