22290012 has 48 divisors (see below), whose sum is σ = 58171680. Its totient is φ = 7380864.

The previous prime is 22290011. The next prime is 22290031. The reversal of 22290012 is 21009222.

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

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22290011) 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, 18088 + ... + 19280.

It is an arithmetic number, because the mean of its divisors is an integer number (1211910).

Almost surely, 2^22290012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22290012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29085840).

22290012 is an abundant number, since it is smaller than the sum of its proper divisors (35881668).

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

22290012 is a wasteful number, since it uses less digits than its factorization.

22290012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379 (or 1371 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 22290012 is about 4721.2299245006. The cubic root of 22290012 is about 281.4298121270.

Adding to 22290012 its reverse (21009222), we get a palindrome (43299234).

The spelling of 22290012 in words is "twenty-two million, two hundred ninety thousand, twelve".