198812906 has 4 divisors (see below), whose sum is σ = 298219362. Its totient is φ = 99406452.

The previous prime is 198812899. The next prime is 198812921. The reversal of 198812906 is 609218891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 198105625 + 707281 = 14075^2 + 841^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49703225 + ... + 49703228.

Almost surely, 2^198812906 is an apocalyptic number.

198812906 is a deficient number, since it is larger than the sum of its proper divisors (99406456).

198812906 is an equidigital number, since it uses as much as digits as its factorization.

198812906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99406455.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 198812906 is about 14100.1030492688. The cubic root of 198812906 is about 583.6442229248.

The spelling of 198812906 in words is "one hundred ninety-eight million, eight hundred twelve thousand, nine hundred six".