198097890 has 64 divisors (see below), whose sum is σ = 483525504. Its totient is φ = 51936768.

The previous prime is 198097877. The next prime is 198097897. The reversal of 198097890 is 98790891.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (198097897) 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, 645117 + ... + 645423.

It is an arithmetic number, because the mean of its divisors is an integer number (7555086).

Almost surely, 2^198097890 is an apocalyptic number.

198097890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198097890 is an abundant number, since it is smaller than the sum of its proper divisors (285427614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198097890 is a wasteful number, since it uses less digits than its factorization.

198097890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 198097890 is about 14074.7252193426. The cubic root of 198097890 is about 582.9437046186.

The spelling of 198097890 in words is "one hundred ninety-eight million, ninety-seven thousand, eight hundred ninety".