198921458 has 6 divisors (see below), whose sum is σ = 298412109. Its totient is φ = 99450756.

The previous prime is 198921449. The next prime is 198921461. The reversal of 198921458 is 854129891.

It can be written as a sum of positive squares in 2 ways, for example, as 164429329 + 34492129 = 12823^2 + 5873^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=9973.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14960 + ... + 24932.

Almost surely, 2^198921458 is an apocalyptic number.

198921458 is a deficient number, since it is larger than the sum of its proper divisors (99490651).

198921458 is an frugal number, since it uses more digits than its factorization.

198921458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19948 (or 9975 counting only the distinct ones).

The product of its digits is 207360, while the sum is 47.

The square root of 198921458 is about 14103.9518575469. The cubic root of 198921458 is about 583.7504269966.

The spelling of 198921458 in words is "one hundred ninety-eight million, nine hundred twenty-one thousand, four hundred fifty-eight".