198691420 has 12 divisors (see below), whose sum is σ = 417252024. Its totient is φ = 79476560.

The previous prime is 198691391. The next prime is 198691421. The reversal of 198691420 is 24196891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198691421) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4967266 + ... + 4967305.

It is an arithmetic number, because the mean of its divisors is an integer number (34771002).

Almost surely, 2^198691420 is an apocalyptic number.

198691420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198691420 is an abundant number, since it is smaller than the sum of its proper divisors (218560604).

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

198691420 is a wasteful number, since it uses less digits than its factorization.

198691420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9934580 (or 9934578 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 198691420 is about 14095.7944082623. The cubic root of 198691420 is about 583.5253187573.

The spelling of 198691420 in words is "one hundred ninety-eight million, six hundred ninety-one thousand, four hundred twenty".