197217720 has 256 divisors, whose sum is σ = 791424000. Its totient is φ = 42674688.

The previous prime is 197217689. The next prime is 197217743. The reversal of 197217720 is 27712791.

197217720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 142954 + ... + 144326.

It is an arithmetic number, because the mean of its divisors is an integer number (3091500).

Almost surely, 2^197217720 is an apocalyptic number.

197217720 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 197217720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (395712000).

197217720 is an abundant number, since it is smaller than the sum of its proper divisors (594206280).

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

197217720 is a wasteful number, since it uses less digits than its factorization.

197217720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419 (or 1409 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 36.

The square root of 197217720 is about 14043.4226597365. The cubic root of 197217720 is about 582.0790624869.

The spelling of 197217720 in words is "one hundred ninety-seven million, two hundred seventeen thousand, seven hundred twenty".