19998226 has 8 divisors (see below), whose sum is σ = 31031820. Its totient is φ = 9654288.

The previous prime is 19998221. The next prime is 19998229. The reversal of 19998226 is 62289991.

It can be written as a sum of positive squares in 2 ways, for example, as 19936225 + 62001 = 4465^2 + 249^2 .

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

It is not an unprimeable number, because it can be changed into a prime (19998221) 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, 172341 + ... + 172456.

Almost surely, 2^19998226 is an apocalyptic number.

19998226 is a deficient number, since it is larger than the sum of its proper divisors (11033594).

19998226 is a wasteful number, since it uses less digits than its factorization.

19998226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344828.

The product of its digits is 139968, while the sum is 46.

The square root of 19998226 is about 4471.9376113716. The cubic root of 19998226 is about 271.4337357941.

The spelling of 19998226 in words is "nineteen million, nine hundred ninety-eight thousand, two hundred twenty-six".