198143690 has 16 divisors (see below), whose sum is σ = 357262920. Its totient is φ = 79123200.

The previous prime is 198143629. The next prime is 198143713. The reversal of 198143690 is 96341891.

It can be written as a sum of positive squares in 4 ways, for example, as 176119441 + 22024249 = 13271^2 + 4693^2 .

It is a super-3 number, since 3×198143690³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10475 + ... + 22494.

Almost surely, 2^198143690 is an apocalyptic number.

198143690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198143690 is a deficient number, since it is larger than the sum of its proper divisors (159119230).

198143690 is a wasteful number, since it uses less digits than its factorization.

198143690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33577.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 198143690 is about 14076.3521552993. The cubic root of 198143690 is about 582.9886264572.

The spelling of 198143690 in words is "one hundred ninety-eight million, one hundred forty-three thousand, six hundred ninety".