22423140 has 72 divisors (see below), whose sum is σ = 68402880. Its totient is φ = 5945664.

The previous prime is 22423133. The next prime is 22423169. The reversal of 22423140 is 4132422.

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

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 23 ways as a sum of consecutive naturals, for example, 62281 + ... + 62639.

It is an arithmetic number, because the mean of its divisors is an integer number (950040).

Almost surely, 2^22423140 is an apocalyptic number.

22423140 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 22423140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34201440).

22423140 is an abundant number, since it is smaller than the sum of its proper divisors (45979740).

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

22423140 is a wasteful number, since it uses less digits than its factorization.

22423140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721 (or 716 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 22423140 is about 4735.3078041454. The cubic root of 22423140 is about 281.9889840272.

Adding to 22423140 its reverse (4132422), we get a palindrome (26555562).

The spelling of 22423140 in words is "twenty-two million, four hundred twenty-three thousand, one hundred forty".