22404312 has 48 divisors (see below), whose sum is σ = 69348240. Its totient is φ = 6401088.

The previous prime is 22404307. The next prime is 22404329. The reversal of 22404312 is 21340422.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21723 + ... + 22730.

It is an arithmetic number, because the mean of its divisors is an integer number (1444755).

Almost surely, 2^22404312 is an apocalyptic number.

It is an amenable number.

22404312 is an abundant number, since it is smaller than the sum of its proper divisors (46943928).

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

22404312 is a wasteful number, since it uses less digits than its factorization.

22404312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44472 (or 44465 counting only the distinct ones).

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

The square root of 22404312 is about 4733.3193427023. The cubic root of 22404312 is about 281.9100361888.

Adding to 22404312 its reverse (21340422), we get a palindrome (43744734).

The spelling of 22404312 in words is "twenty-two million, four hundred four thousand, three hundred twelve".