198209743 has 4 divisors (see below), whose sum is σ = 199317240. Its totient is φ = 197102248.

The previous prime is 198209741. The next prime is 198209779. The reversal of 198209743 is 347902891.

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

It is a cyclic number.

It is not a de Polignac number, because 198209743 - 2¹ = 198209741 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198209743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198209741) 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, 553480 + ... + 553837.

It is an arithmetic number, because the mean of its divisors is an integer number (49829310).

Almost surely, 2^198209743 is an apocalyptic number.

198209743 is a deficient number, since it is larger than the sum of its proper divisors (1107497).

198209743 is a wasteful number, since it uses less digits than its factorization.

198209743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107496.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 198209743 is about 14078.6981997626. The cubic root of 198209743 is about 583.0534007792.

The spelling of 198209743 in words is "one hundred ninety-eight million, two hundred nine thousand, seven hundred forty-three".