19491198 has 16 divisors (see below), whose sum is σ = 39290880. Its totient is φ = 6445656.

The previous prime is 19491191. The next prime is 19491209. The reversal of 19491198 is 89119491.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19491191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12028 + ... + 13551.

It is an arithmetic number, because the mean of its divisors is an integer number (2455680).

Almost surely, 2^19491198 is an apocalyptic number.

19491198 is an abundant number, since it is smaller than the sum of its proper divisors (19799682).

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

19491198 is a wasteful number, since it uses less digits than its factorization.

19491198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25711.

The product of its digits is 23328, while the sum is 42.

The square root of 19491198 is about 4414.8836904272. The cubic root of 19491198 is about 269.1201261868.

The spelling of 19491198 in words is "nineteen million, four hundred ninety-one thousand, one hundred ninety-eight".