22139730 has 56 divisors (see below), whose sum is σ = 59769612. Its totient is φ = 5901984.

The previous prime is 22139699. The next prime is 22139737. The reversal of 22139730 is 3793122.

It can be written as a sum of positive squares in 2 ways, for example, as 21818241 + 321489 = 4671^2 + 567^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22139694 and 22139703.

It is not an unprimeable number, because it can be changed into a prime (22139737) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5772 + ... + 8808.

Almost surely, 2^22139730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22139730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29884806).

22139730 is an abundant number, since it is smaller than the sum of its proper divisors (37629882).

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

22139730 is an equidigital number, since it uses as much as digits as its factorization.

22139730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3062 (or 3047 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 22139730 is about 4705.2874513679. The cubic root of 22139730 is about 280.7959072382.

The spelling of 22139730 in words is "twenty-two million, one hundred thirty-nine thousand, seven hundred thirty".