198966869 has 4 divisors (see below), whose sum is σ = 200936940. Its totient is φ = 196996800.

The previous prime is 198966857. The next prime is 198966877. The reversal of 198966869 is 968669891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 151536100 + 47430769 = 12310^2 + 6887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198966869 is a prime.

It is a super-2 number, since 2×198966869² = 79175629919326322, 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 (198966899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 984884 + ... + 985085.

It is an arithmetic number, because the mean of its divisors is an integer number (50234235).

Almost surely, 2^198966869 is an apocalyptic number.

It is an amenable number.

198966869 is a deficient number, since it is larger than the sum of its proper divisors (1970071).

198966869 is a wasteful number, since it uses less digits than its factorization.

198966869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970070.

The product of its digits is 10077696, while the sum is 62.

The square root of 198966869 is about 14105.5616336252. The cubic root of 198966869 is about 583.7948443159.

The spelling of 198966869 in words is "one hundred ninety-eight million, nine hundred sixty-six thousand, eight hundred sixty-nine".