197216397 has 32 divisors (see below), whose sum is σ = 336358400. Its totient is φ = 111869424.

The previous prime is 197216359. The next prime is 197216399. The reversal of 197216397 is 793612791.

197216397 is a `hidden beast` number, since 1 + 9 + 7 + 2 + 1 + 639 + 7 = 666.

It is not a de Polignac number, because 197216397 - 2¹⁰ = 197215373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197216399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22518 + ... + 30024.

It is an arithmetic number, because the mean of its divisors is an integer number (10511200).

Almost surely, 2^197216397 is an apocalyptic number.

It is an amenable number.

197216397 is a deficient number, since it is larger than the sum of its proper divisors (139142003).

197216397 is a wasteful number, since it uses less digits than its factorization.

197216397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7662 (or 7656 counting only the distinct ones).

The product of its digits is 142884, while the sum is 45.

The square root of 197216397 is about 14043.3755557558. The cubic root of 197216397 is about 582.0777608927.

The spelling of 197216397 in words is "one hundred ninety-seven million, two hundred sixteen thousand, three hundred ninety-seven".