198990669 has 8 divisors (see below), whose sum is σ = 267078592. Its totient is φ = 131781600.

The previous prime is 198990607. The next prime is 198990677. The reversal of 198990669 is 966099891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198990669 - 2⁸ = 198990413 is a prime.

It is a super-2 number, since 2×198990669² = 79194572698135122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198991669) 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 7 ways as a sum of consecutive naturals, for example, 219184 + ... + 220089.

It is an arithmetic number, because the mean of its divisors is an integer number (33384824).

Almost surely, 2^198990669 is an apocalyptic number.

It is an amenable number.

198990669 is a deficient number, since it is larger than the sum of its proper divisors (68087923).

198990669 is a wasteful number, since it uses less digits than its factorization.

198990669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439427.

The product of its (nonzero) digits is 1889568, while the sum is 57.

The square root of 198990669 is about 14106.4052472627. The cubic root of 198990669 is about 583.8181208265.

The spelling of 198990669 in words is "one hundred ninety-eight million, nine hundred ninety thousand, six hundred sixty-nine".