198898990 has 8 divisors (see below), whose sum is σ = 358018200. Its totient is φ = 79559592.

The previous prime is 198898969. The next prime is 198898991. The reversal of 198898990 is 99898891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198898991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9944940 + ... + 9944959.

It is an arithmetic number, because the mean of its divisors is an integer number (44752275).

Almost surely, 2^198898990 is an apocalyptic number.

198898990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198898990 is a deficient number, since it is larger than the sum of its proper divisors (159119210).

198898990 is a wasteful number, since it uses less digits than its factorization.

198898990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19889906.

The product of its (nonzero) digits is 3359232, while the sum is 61.

The square root of 198898990 is about 14103.1553207075. The cubic root of 198898990 is about 583.7284481403.

Subtracting from 198898990 its reverse (99898891), we obtain a palindrome (99000099).

The spelling of 198898990 in words is "one hundred ninety-eight million, eight hundred ninety-eight thousand, nine hundred ninety".