19998922 has 16 divisors (see below), whose sum is σ = 31140000. Its totient is φ = 9621360.

The previous prime is 19998917. The next prime is 19998943. The reversal of 19998922 is 22989991.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28597 + ... + 29287.

It is an arithmetic number, because the mean of its divisors is an integer number (1946250).

Almost surely, 2^19998922 is an apocalyptic number.

19998922 is a deficient number, since it is larger than the sum of its proper divisors (11141078).

19998922 is a wasteful number, since it uses less digits than its factorization.

19998922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221.

The product of its digits is 209952, while the sum is 49.

The square root of 19998922 is about 4472.0154293115. The cubic root of 19998922 is about 271.4368846682.

The spelling of 19998922 in words is "nineteen million, nine hundred ninety-eight thousand, nine hundred twenty-two".