198669909 has 16 divisors (see below), whose sum is σ = 286374080. Its totient is φ = 122083200.

The previous prime is 198669901. The next prime is 198669931. The reversal of 198669909 is 909966891.

It is not a de Polignac number, because 198669909 - 2³ = 198669901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198669901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44992 + ... + 49209.

It is an arithmetic number, because the mean of its divisors is an integer number (17898380).

Almost surely, 2^198669909 is an apocalyptic number.

198669909 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

198669909 is a deficient number, since it is larger than the sum of its proper divisors (87704171).

198669909 is a wasteful number, since it uses less digits than its factorization.

198669909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94260.

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

The square root of 198669909 is about 14095.0313586029. The cubic root of 198669909 is about 583.5042598609.

The spelling of 198669909 in words is "one hundred ninety-eight million, six hundred sixty-nine thousand, nine hundred nine".