22172040 has 144 divisors (see below), whose sum is σ = 79361100. Its totient is φ = 5364480.

The previous prime is 22172027. The next prime is 22172057. The reversal of 22172040 is 4027122.

It can be written as a sum of positive squares in 2 ways, for example, as 21958596 + 213444 = 4686^2 + 462^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 43306 + ... + 43814.

Almost surely, 2^22172040 is an apocalyptic number.

22172040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22172040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39680550).

22172040 is an abundant number, since it is smaller than the sum of its proper divisors (57189060).

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

22172040 is a wasteful number, since it uses less digits than its factorization.

22172040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 530 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 22172040 is about 4708.7195711786. The cubic root of 22172040 is about 280.9324356415.

Adding to 22172040 its reverse (4027122), we get a palindrome (26199162).

The spelling of 22172040 in words is "twenty-two million, one hundred seventy-two thousand, forty".