197812818 has 48 divisors (see below), whose sum is σ = 490703616. Its totient is φ = 56416320.

The previous prime is 197812817. The next prime is 197812831. The reversal of 197812818 is 818218791.

It is a happy number.

It is a super-2 number, since 2×197812818² = 78259821930202248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (197812817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94855 + ... + 96917.

It is an arithmetic number, because the mean of its divisors is an integer number (10222992).

Almost surely, 2^197812818 is an apocalyptic number.

197812818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

197812818 is an abundant number, since it is smaller than the sum of its proper divisors (292890798).

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

197812818 is a wasteful number, since it uses less digits than its factorization.

197812818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2839 (or 2836 counting only the distinct ones).

The product of its digits is 64512, while the sum is 45.

The square root of 197812818 is about 14064.5944840226. The cubic root of 197812818 is about 582.6639427534.

The spelling of 197812818 in words is "one hundred ninety-seven million, eight hundred twelve thousand, eight hundred eighteen".