198562823 has 4 divisors (see below), whose sum is σ = 198615648. Its totient is φ = 198510000.

The previous prime is 198562753. The next prime is 198562879. The reversal of 198562823 is 328265891.

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 198562823 - 2¹⁸ = 198300679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198562883) 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, 20303 + ... + 28448.

It is an arithmetic number, because the mean of its divisors is an integer number (49653912).

Almost surely, 2^198562823 is an apocalyptic number.

198562823 is a deficient number, since it is larger than the sum of its proper divisors (52825).

198562823 is an equidigital number, since it uses as much as digits as its factorization.

198562823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52824.

The product of its digits is 207360, while the sum is 44.

The square root of 198562823 is about 14091.2321320742. The cubic root of 198562823 is about 583.3994018955.

The spelling of 198562823 in words is "one hundred ninety-eight million, five hundred sixty-two thousand, eight hundred twenty-three".