198209649 has 16 divisors (see below), whose sum is σ = 289808064. Its totient is φ = 119500800.

The previous prime is 198209623. The next prime is 198209663. The reversal of 198209649 is 946902891.

It is not a de Polignac number, because 198209649 - 2⁵ = 198209617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198209598 and 198209607.

It is not an unprimeable number, because it can be changed into a prime (198209149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9192 + ... + 21929.

It is an arithmetic number, because the mean of its divisors is an integer number (18113004).

Almost surely, 2^198209649 is an apocalyptic number.

It is an amenable number.

198209649 is a deficient number, since it is larger than the sum of its proper divisors (91598415).

198209649 is a wasteful number, since it uses less digits than its factorization.

198209649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31328.

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 198209649 is about 14078.6948613854. The cubic root of 198209649 is about 583.0533086091.

The spelling of 198209649 in words is "one hundred ninety-eight million, two hundred nine thousand, six hundred forty-nine".