198421404 has 24 divisors (see below), whose sum is σ = 472835328. Its totient is φ = 64733040.

The previous prime is 198421387. The next prime is 198421411. The reversal of 198421404 is 404124891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175342 + ... + 176469.

It is an arithmetic number, because the mean of its divisors is an integer number (19701472).

Almost surely, 2^198421404 is an apocalyptic number.

It is an amenable number.

198421404 is an abundant number, since it is smaller than the sum of its proper divisors (274413924).

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

198421404 is a wasteful number, since it uses less digits than its factorization.

198421404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351865 (or 351863 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 198421404 is about 14086.2132597799. The cubic root of 198421404 is about 583.2608674789.

The spelling of 198421404 in words is "one hundred ninety-eight million, four hundred twenty-one thousand, four hundred four".