198527805 has 24 divisors (see below), whose sum is σ = 393274752. Its totient is φ = 90755424.

The previous prime is 198527803. The next prime is 198527809. The reversal of 198527805 is 508725891.

It is a happy number.

It is not a de Polignac number, because 198527805 - 2¹ = 198527803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198527801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 314809 + ... + 315438.

It is an arithmetic number, because the mean of its divisors is an integer number (16386448).

Almost surely, 2^198527805 is an apocalyptic number.

198527805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

198527805 is a deficient number, since it is larger than the sum of its proper divisors (194746947).

198527805 is a wasteful number, since it uses less digits than its factorization.

198527805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630265 (or 630262 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The square root of 198527805 is about 14089.9895315788. The cubic root of 198527805 is about 583.3651043013.

The spelling of 198527805 in words is "one hundred ninety-eight million, five hundred twenty-seven thousand, eight hundred five".