22173138 has 72 divisors (see below), whose sum is σ = 53698788. Its totient is φ = 6604416.

The previous prime is 22173131. The next prime is 22173157. The reversal of 22173138 is 83137122.

It can be written as a sum of positive squares in 6 ways, for example, as 14538969 + 7634169 = 3813^2 + 2763^2 .

Its product of digits (2016) is a multiple of the sum of its prime divisors (252).

It is not an unprimeable number, because it can be changed into a prime (22173131) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 112456 + ... + 112652.

Almost surely, 2^22173138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22173138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26849394).

22173138 is an abundant number, since it is smaller than the sum of its proper divisors (31525650).

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

22173138 is a wasteful number, since it uses less digits than its factorization.

22173138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 252 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 22173138 is about 4708.8361619407. The cubic root of 22173138 is about 280.9370729944.

The spelling of 22173138 in words is "twenty-two million, one hundred seventy-three thousand, one hundred thirty-eight".