198400165 has 16 divisors (see below), whose sum is σ = 248569200. Its totient is φ = 151828992.

The previous prime is 198400159. The next prime is 198400171. The reversal of 198400165 is 561004891.

It is an interprime number because it is at equal distance from previous prime (198400159) and next prime (198400171).

It can be written as a sum of positive squares in 8 ways, for example, as 31292836 + 167107329 = 5594^2 + 12927^2 .

It is a cyclic number.

It is not a de Polignac number, because 198400165 - 2³ = 198400157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198400165.

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, 9529 + ... + 22081.

It is an arithmetic number, because the mean of its divisors is an integer number (15535575).

Almost surely, 2^198400165 is an apocalyptic number.

It is an amenable number.

198400165 is a deficient number, since it is larger than the sum of its proper divisors (50169035).

198400165 is a wasteful number, since it uses less digits than its factorization.

198400165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12696.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 198400165 is about 14085.4593464324. The cubic root of 198400165 is about 583.2400560151.

The spelling of 198400165 in words is "one hundred ninety-eight million, four hundred thousand, one hundred sixty-five".