197117720 has 64 divisors (see below), whose sum is σ = 472042080. Its totient is φ = 73824256.

The previous prime is 197117717. The next prime is 197117731. The reversal of 197117720 is 27711791.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 153722 + ... + 154998.

Almost surely, 2^197117720 is an apocalyptic number.

197117720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197117720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236021040).

197117720 is an abundant number, since it is smaller than the sum of its proper divisors (274924360).

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

197117720 is a wasteful number, since it uses less digits than its factorization.

197117720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532 (or 1528 counting only the distinct ones).

The product of its (nonzero) digits is 6174, while the sum is 35.

The square root of 197117720 is about 14039.8618226819. The cubic root of 197117720 is about 581.9806640482.

It can be divided in two parts, 1971 and 17720, that added together give a palindrome (19691).

The spelling of 197117720 in words is "one hundred ninety-seven million, one hundred seventeen thousand, seven hundred twenty".