198849690 has 48 divisors (see below), whose sum is σ = 556782408. Its totient is φ = 48947328.

The previous prime is 198849689. The next prime is 198849719. The reversal of 198849690 is 96948891.

It can be written as a sum of positive squares in 4 ways, for example, as 50424201 + 148425489 = 7101^2 + 12183^2 .

It is a super-2 number, since 2×198849690² = 79082398426192200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83809 + ... + 86148.

Almost surely, 2^198849690 is an apocalyptic number.

198849690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198849690 is an abundant number, since it is smaller than the sum of its proper divisors (357932718).

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

198849690 is a wasteful number, since it uses less digits than its factorization.

198849690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169983 (or 169980 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 198849690 is about 14101.4073765706. The cubic root of 198849690 is about 583.6802156338.

The spelling of 198849690 in words is "one hundred ninety-eight million, eight hundred forty-nine thousand, six hundred ninety".