22815012 has 48 divisors (see below), whose sum is σ = 58367232. Its totient is φ = 6878880.

The previous prime is 22815007. The next prime is 22815017. The reversal of 22815012 is 21051822.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22815007) and next prime (22815017).

It is a self number, because there is not a number n which added to its sum of digits gives 22815012.

It is not an unprimeable number, because it can be changed into a prime (22815017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40243 + ... + 40805.

It is an arithmetic number, because the mean of its divisors is an integer number (1215984).

Almost surely, 2^22815012 is an apocalyptic number.

22815012 is a gapful number since it is divisible by the number (22) 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 22815012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29183616).

22815012 is an abundant number, since it is smaller than the sum of its proper divisors (35552220).

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

22815012 is a wasteful number, since it uses less digits than its factorization.

22815012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888 (or 886 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 22815012 is about 4776.5062545756. The cubic root of 22815012 is about 283.6222081050.

Adding to 22815012 its reverse (21051822), we get a palindrome (43866834).

The spelling of 22815012 in words is "twenty-two million, eight hundred fifteen thousand, twelve".