22138842 has 32 divisors (see below), whose sum is σ = 49222080. Its totient is φ = 6581120.

The previous prime is 22138841. The next prime is 22138859. The reversal of 22138842 is 24883122.

It is not an unprimeable number, because it can be changed into a prime (22138841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334 + ... + 6662.

It is an arithmetic number, because the mean of its divisors is an integer number (1538190).

Almost surely, 2^22138842 is an apocalyptic number.

22138842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 22138842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24611040).

22138842 is an abundant number, since it is smaller than the sum of its proper divisors (27083238).

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

22138842 is a wasteful number, since it uses less digits than its factorization.

22138842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6398.

The product of its digits is 6144, while the sum is 30.

The square root of 22138842 is about 4705.1930884928. The cubic root of 22138842 is about 280.7921530506.

The spelling of 22138842 in words is "twenty-two million, one hundred thirty-eight thousand, eight hundred forty-two".