198945290 has 32 divisors (see below), whose sum is σ = 370759680. Its totient is φ = 76780800.

The previous prime is 198945283. The next prime is 198945317. The reversal of 198945290 is 92549891.

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, 132866 + ... + 134354.

It is an arithmetic number, because the mean of its divisors is an integer number (11586240).

Almost surely, 2^198945290 is an apocalyptic number.

198945290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198945290 is a deficient number, since it is larger than the sum of its proper divisors (171814390).

198945290 is a wasteful number, since it uses less digits than its factorization.

198945290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 198945290 is about 14104.7967018316. The cubic root of 198945290 is about 583.7737383490.

The spelling of 198945290 in words is "one hundred ninety-eight million, nine hundred forty-five thousand, two hundred ninety".