197992217 has 16 divisors (see below), whose sum is σ = 226650240. Its totient is φ = 171756288.

The previous prime is 197992213. The next prime is 197992231. The reversal of 197992217 is 712299791.

It is a cyclic number.

It is not a de Polignac number, because 197992217 - 2² = 197992213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (197992213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3668 + ... + 20234.

It is an arithmetic number, because the mean of its divisors is an integer number (14165640).

Almost surely, 2^197992217 is an apocalyptic number.

197992217 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

197992217 is a deficient number, since it is larger than the sum of its proper divisors (28658023).

197992217 is a wasteful number, since it uses less digits than its factorization.

197992217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16640.

The product of its digits is 142884, while the sum is 47.

The square root of 197992217 is about 14070.9707198899. The cubic root of 197992217 is about 582.8400313507.

The spelling of 197992217 in words is "one hundred ninety-seven million, nine hundred ninety-two thousand, two hundred seventeen".