38912221 has 4 divisors (see below), whose sum is σ = 38936700. Its totient is φ = 38887744.

The previous prime is 38912219. The next prime is 38912227. The reversal of 38912221 is 12221983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12221983 = 199 ⋅61417.

It can be written as a sum of positive squares in 2 ways, for example, as 3080025 + 35832196 = 1755^2 + 5986^2 .

It is a cyclic number.

It is not a de Polignac number, because 38912221 - 2¹ = 38912219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38912221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38912227) 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, 9676 + ... + 13093.

It is an arithmetic number, because the mean of its divisors is an integer number (9734175).

Almost surely, 2^38912221 is an apocalyptic number.

It is an amenable number.

38912221 is a deficient number, since it is larger than the sum of its proper divisors (24479).

38912221 is a wasteful number, since it uses less digits than its factorization.

38912221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24478.

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

The square root of 38912221 is about 6237.9660948101. The cubic root of 38912221 is about 338.8665282667.

The spelling of 38912221 in words is "thirty-eight million, nine hundred twelve thousand, two hundred twenty-one".