19921198 has 24 divisors (see below), whose sum is σ = 33075504. Its totient is φ = 8991840.

The previous prime is 19921183. The next prime is 19921199. The reversal of 19921198 is 89112991.

It is a super-3 number, since 3×19921198³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19921198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19921199) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63490 + ... + 63802.

It is an arithmetic number, because the mean of its divisors is an integer number (1378146).

Almost surely, 2^19921198 is an apocalyptic number.

19921198 is a deficient number, since it is larger than the sum of its proper divisors (13154306).

19921198 is a wasteful number, since it uses less digits than its factorization.

19921198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600 (or 589 counting only the distinct ones).

The product of its digits is 11664, while the sum is 40.

The square root of 19921198 is about 4463.3169280256. The cubic root of 19921198 is about 271.0847898516.

The spelling of 19921198 in words is "nineteen million, nine hundred twenty-one thousand, one hundred ninety-eight".