22404402 has 48 divisors (see below), whose sum is σ = 51790752. Its totient is φ = 6975360.

The previous prime is 22404391. The next prime is 22404427. The reversal of 22404402 is 20440422.

22404402 is a `hidden beast` number, since 224 + 0 + 440 + 2 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64393 + ... + 64739.

It is an arithmetic number, because the mean of its divisors is an integer number (1078974).

Almost surely, 2^22404402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22404402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25895376).

22404402 is an abundant number, since it is smaller than the sum of its proper divisors (29386350).

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

22404402 is a wasteful number, since it uses less digits than its factorization.

22404402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 22404402 is about 4733.3288497631. The cubic root of 22404402 is about 281.9104136737.

Adding to 22404402 its reverse (20440422), we get a palindrome (42844824).

The spelling of 22404402 in words is "twenty-two million, four hundred four thousand, four hundred two".