22038397 has 4 divisors (see below), whose sum is σ = 22118236. Its totient is φ = 21958560.

The previous prime is 22038391. The next prime is 22038413. The reversal of 22038397 is 79383022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79383022 = 2 ⋅39691511.

It can be written as a sum of positive squares in 2 ways, for example, as 3556996 + 18481401 = 1886^2 + 4299^2 .

It is a cyclic number.

It is not a de Polignac number, because 22038397 - 2³ = 22038389 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 (22038391) 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, 39504 + ... + 40057.

It is an arithmetic number, because the mean of its divisors is an integer number (5529559).

Almost surely, 2^22038397 is an apocalyptic number.

It is an amenable number.

22038397 is a deficient number, since it is larger than the sum of its proper divisors (79839).

22038397 is an equidigital number, since it uses as much as digits as its factorization.

22038397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79838.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 22038397 is about 4694.5071093779. The cubic root of 22038397 is about 280.3668533260.

The spelling of 22038397 in words is "twenty-two million, thirty-eight thousand, three hundred ninety-seven".