22144378 has 4 divisors (see below), whose sum is σ = 33216570. Its totient is φ = 11072188.

The previous prime is 22144361. The next prime is 22144391. The reversal of 22144378 is 87344122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87344122 = 2 ⋅43672061.

It can be written as a sum of positive squares in only one way, i.e., 20638849 + 1505529 = 4543^2 + 1227^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5536093 + ... + 5536096.

Almost surely, 2^22144378 is an apocalyptic number.

22144378 is a deficient number, since it is larger than the sum of its proper divisors (11072192).

22144378 is a wasteful number, since it uses less digits than its factorization.

22144378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11072191.

The product of its digits is 10752, while the sum is 31.

The square root of 22144378 is about 4705.7813378864. The cubic root of 22144378 is about 280.8155558978.

It can be divided in two parts, 22144 and 378, that added together give a palindrome (22522).

The spelling of 22144378 in words is "twenty-two million, one hundred forty-four thousand, three hundred seventy-eight".