198970805 has 32 divisors (see below), whose sum is σ = 277250688. Its totient is φ = 135475200.

The previous prime is 198970801. The next prime is 198970817. The reversal of 198970805 is 508079891.

It is a happy number.

It is not a de Polignac number, because 198970805 - 2² = 198970801 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 198970805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198970801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 224894 + ... + 225776.

It is an arithmetic number, because the mean of its divisors is an integer number (8664084).

Almost surely, 2^198970805 is an apocalyptic number.

It is an amenable number.

198970805 is a deficient number, since it is larger than the sum of its proper divisors (78279883).

198970805 is a wasteful number, since it uses less digits than its factorization.

198970805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 198970805 is about 14105.7011523710. The cubic root of 198970805 is about 583.7986938702.

The spelling of 198970805 in words is "one hundred ninety-eight million, nine hundred seventy thousand, eight hundred five".