18909822 has 8 divisors (see below), whose sum is σ = 37819656. Its totient is φ = 6303272.

The previous prime is 18909811. The next prime is 18909823. The reversal of 18909822 is 22890981.

It is a sphenic number, since it is the product of 3 distinct primes.

18909822 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18909823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1575813 + ... + 1575824.

It is an arithmetic number, because the mean of its divisors is an integer number (4727457).

Almost surely, 2^18909822 is an apocalyptic number.

18909822 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18909822 is a wasteful number, since it uses less digits than its factorization.

18909822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3151642.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 18909822 is about 4348.5425144524. The cubic root of 18909822 is about 266.4173353525.

The spelling of 18909822 in words is "eighteen million, nine hundred nine thousand, eight hundred twenty-two".