22443138 has 12 divisors (see below), whose sum is σ = 48626838. Its totient is φ = 7481040.

The previous prime is 22443133. The next prime is 22443139. The reversal of 22443138 is 83134422.

22443138 is a `hidden beast` number, since 224 + 431 + 3 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22439169 + 3969 = 4737^2 + 63^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22443131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 623403 + ... + 623438.

Almost surely, 2^22443138 is an apocalyptic number.

22443138 is an abundant number, since it is smaller than the sum of its proper divisors (26183700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22443138 is a wasteful number, since it uses less digits than its factorization.

22443138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246849 (or 1246846 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 22443138 is about 4737.4189175119. The cubic root of 22443138 is about 282.0727894189.

The spelling of 22443138 in words is "twenty-two million, four hundred forty-three thousand, one hundred thirty-eight".