22172740 has 24 divisors (see below), whose sum is σ = 46654272. Its totient is φ = 8851680.

The previous prime is 22172737. The next prime is 22172749. The reversal of 22172740 is 4727122.

It is not an unprimeable number, because it can be changed into a prime (22172749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15537 + ... + 16903.

It is an arithmetic number, because the mean of its divisors is an integer number (1943928).

Almost surely, 2^22172740 is an apocalyptic number.

22172740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22172740 is an abundant number, since it is smaller than the sum of its proper divisors (24481532).

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

22172740 is a wasteful number, since it uses less digits than its factorization.

22172740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187 (or 2185 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 22172740 is about 4708.7939007776. The cubic root of 22172740 is about 280.9353920772.

Adding to 22172740 its reverse (4727122), we get a palindrome (26899862).

The spelling of 22172740 in words is "twenty-two million, one hundred seventy-two thousand, seven hundred forty".