197385817 has 8 divisors (see below), whose sum is σ = 198950976. Its totient is φ = 195825552.

The previous prime is 197385809. The next prime is 197385821. The reversal of 197385817 is 718583791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197385817 - 2³ = 197385809 is a prime.

It is a super-2 number, since 2×197385817² = 77922321505514978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197385847) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 132358 + ... + 133840.

It is an arithmetic number, because the mean of its divisors is an integer number (24868872).

Almost surely, 2^197385817 is an apocalyptic number.

It is an amenable number.

197385817 is a deficient number, since it is larger than the sum of its proper divisors (1565159).

197385817 is a wasteful number, since it uses less digits than its factorization.

197385817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2447.

The product of its digits is 423360, while the sum is 49.

The square root of 197385817 is about 14049.4062863880. The cubic root of 197385817 is about 582.2443923873.

The spelling of 197385817 in words is "one hundred ninety-seven million, three hundred eighty-five thousand, eight hundred seventeen".