198471990 has 16 divisors (see below), whose sum is σ = 476332848. Its totient is φ = 52925856.

The previous prime is 198471989. The next prime is 198471997. The reversal of 198471990 is 99174891.

It is a super-2 number, since 2×198471990² = 78782261629120200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198471997) 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, 3307837 + ... + 3307896.

It is an arithmetic number, because the mean of its divisors is an integer number (29770803).

Almost surely, 2^198471990 is an apocalyptic number.

198471990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198471990 is an abundant number, since it is smaller than the sum of its proper divisors (277860858).

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

198471990 is a wasteful number, since it uses less digits than its factorization.

198471990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6615743.

The product of its (nonzero) digits is 163296, while the sum is 48.

The square root of 198471990 is about 14088.0087308320. The cubic root of 198471990 is about 583.3104292141.

The spelling of 198471990 in words is "one hundred ninety-eight million, four hundred seventy-one thousand, nine hundred ninety".