22172340 has 24 divisors (see below), whose sum is σ = 62082720. Its totient is φ = 5912608.

The previous prime is 22172329. The next prime is 22172351. The reversal of 22172340 is 4327122.

It is an interprime number because it is at equal distance from previous prime (22172329) and next prime (22172351).

It is a super-2 number, since 2×22172340² = 983225322151200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184710 + ... + 184829.

It is an arithmetic number, because the mean of its divisors is an integer number (2586780).

Almost surely, 2^22172340 is an apocalyptic number.

22172340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22172340 is an abundant number, since it is smaller than the sum of its proper divisors (39910380).

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

22172340 is a wasteful number, since it uses less digits than its factorization.

22172340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369551 (or 369549 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 22172340 is about 4708.7514268647. The cubic root of 22172340 is about 280.9337026930.

Adding to 22172340 its reverse (4327122), we get a palindrome (26499462).

The spelling of 22172340 in words is "twenty-two million, one hundred seventy-two thousand, three hundred forty".