198874989 has 12 divisors (see below), whose sum is σ = 287516476. Its totient is φ = 132466752.

The previous prime is 198874987. The next prime is 198874999. The reversal of 198874989 is 989478891.

It can be written as a sum of positive squares in 2 ways, for example, as 23444964 + 175430025 = 4842^2 + 13245^2 .

It is not a de Polignac number, because 198874989 - 2¹ = 198874987 is a prime.

It is a super-2 number, since 2×198874989² = 79102522499500242, 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 (198874981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1809 + ... + 20025.

Almost surely, 2^198874989 is an apocalyptic number.

It is an amenable number.

198874989 is a deficient number, since it is larger than the sum of its proper divisors (88641487).

198874989 is a wasteful number, since it uses less digits than its factorization.

198874989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19436 (or 19433 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 63.

The square root of 198874989 is about 14102.3043861633. The cubic root of 198874989 is about 583.7049678299.

The spelling of 198874989 in words is "one hundred ninety-eight million, eight hundred seventy-four thousand, nine hundred eighty-nine".