198697805 has 16 divisors (see below), whose sum is σ = 251282304. Its totient is φ = 150532800.

The previous prime is 198697799. The next prime is 198697843. The reversal of 198697805 is 508796891.

It is not a de Polignac number, because 198697805 - 2⁴ = 198697789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3062 + ... + 20168.

It is an arithmetic number, because the mean of its divisors is an integer number (15705144).

Almost surely, 2^198697805 is an apocalyptic number.

It is an amenable number.

198697805 is a deficient number, since it is larger than the sum of its proper divisors (52584499).

198697805 is a wasteful number, since it uses less digits than its factorization.

198697805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17236.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The square root of 198697805 is about 14096.0208924363. The cubic root of 198697805 is about 583.5315692692.

The spelling of 198697805 in words is "one hundred ninety-eight million, six hundred ninety-seven thousand, eight hundred five".