197117818 has 16 divisors (see below), whose sum is σ = 312095520. Its totient is φ = 93114576.

The previous prime is 197117803. The next prime is 197117821. The reversal of 197117818 is 818711791.

It is a super-2 number, since 2×197117818² = 77710868346162248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7221 + ... + 21127.

It is an arithmetic number, because the mean of its divisors is an integer number (19505970).

Almost surely, 2^197117818 is an apocalyptic number.

197117818 is a deficient number, since it is larger than the sum of its proper divisors (114977702).

197117818 is a wasteful number, since it uses less digits than its factorization.

197117818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14301.

The product of its digits is 28224, while the sum is 43.

The square root of 197117818 is about 14039.8653127443. The cubic root of 197117818 is about 581.9807604950.

The spelling of 197117818 in words is "one hundred ninety-seven million, one hundred seventeen thousand, eight hundred eighteen".