22418004 has 48 divisors (see below), whose sum is σ = 61405568. Its totient is φ = 6231168.

The previous prime is 22418003. The next prime is 22418017. The reversal of 22418004 is 40081422.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22418003) 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, 499 + ... + 6714.

Almost surely, 2^22418004 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 22418004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30702784).

22418004 is an abundant number, since it is smaller than the sum of its proper divisors (38987564).

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

22418004 is a wasteful number, since it uses less digits than its factorization.

22418004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7264 (or 7262 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 22418004 is about 4734.7654640964. The cubic root of 22418004 is about 281.9674526090.

Adding to 22418004 its reverse (40081422), we get a palindrome (62499426).

The spelling of 22418004 in words is "twenty-two million, four hundred eighteen thousand, four".