198111992 has 32 divisors (see below), whose sum is σ = 413834400. Its totient is φ = 88281984.

The previous prime is 198111989. The next prime is 198112007. The reversal of 198111992 is 299111891.

It is a super-2 number, since 2×198111992² = 78496722748416128, which contains 22 as substring.

It is a congruent 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, 29828 + ... + 35859.

It is an arithmetic number, because the mean of its divisors is an integer number (12932325).

Almost surely, 2^198111992 is an apocalyptic number.

It is an amenable number.

198111992 is an abundant number, since it is smaller than the sum of its proper divisors (215722408).

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

198111992 is a wasteful number, since it uses less digits than its factorization.

198111992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65735 (or 65731 counting only the distinct ones).

The product of its digits is 11664, while the sum is 41.

The square root of 198111992 is about 14075.2261793550. The cubic root of 198111992 is about 582.9575369669.

The spelling of 198111992 in words is "one hundred ninety-eight million, one hundred eleven thousand, nine hundred ninety-two".