22404390 has 16 divisors (see below), whose sum is σ = 53770608. Its totient is φ = 5974496.

The previous prime is 22404367. The next prime is 22404391. The reversal of 22404390 is 9340422.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22404390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22404391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373377 + ... + 373436.

It is an arithmetic number, because the mean of its divisors is an integer number (3360663).

Almost surely, 2^22404390 is an apocalyptic number.

22404390 is an abundant number, since it is smaller than the sum of its proper divisors (31366218).

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

22404390 is a wasteful number, since it uses less digits than its factorization.

22404390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746823.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 22404390 is about 4733.3275821561. The cubic root of 22404390 is about 281.9103633425.

The spelling of 22404390 in words is "twenty-two million, four hundred four thousand, three hundred ninety".