197828717 has 4 divisors (see below), whose sum is σ = 198020160. Its totient is φ = 197637276.

The previous prime is 197828693. The next prime is 197828723. The reversal of 197828717 is 717828791.

It is a happy number.

197828717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197828717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197828017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94163 + ... + 96240.

It is an arithmetic number, because the mean of its divisors is an integer number (49505040).

Almost surely, 2^197828717 is an apocalyptic number.

It is an amenable number.

197828717 is a deficient number, since it is larger than the sum of its proper divisors (191443).

197828717 is a wasteful number, since it uses less digits than its factorization.

197828717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191442.

The product of its digits is 395136, while the sum is 50.

The square root of 197828717 is about 14065.1596862602. The cubic root of 197828717 is about 582.6795526718.

The spelling of 197828717 in words is "one hundred ninety-seven million, eight hundred twenty-eight thousand, seven hundred seventeen".