22001998 has 8 divisors (see below), whose sum is σ = 33185880. Its totient is φ = 10940040.

The previous prime is 22001989. The next prime is 22001999. The reversal of 22001998 is 89910022.

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

22001998 is a modest number, since divided by 1998 gives 22 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30028 + ... + 30751.

It is an arithmetic number, because the mean of its divisors is an integer number (4148235).

Almost surely, 2^22001998 is an apocalyptic number.

22001998 is a deficient number, since it is larger than the sum of its proper divisors (11183882).

22001998 is a wasteful number, since it uses less digits than its factorization.

22001998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60962.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 22001998 is about 4690.6287425035. The cubic root of 22001998 is about 280.2124153460.

The spelling of 22001998 in words is "twenty-two million, one thousand, nine hundred ninety-eight".