197187993 has 32 divisors (see below), whose sum is σ = 314695680. Its totient is φ = 121674960.

The previous prime is 197187979. The next prime is 197188093. The reversal of 197187993 is 399781791.

197187993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 197187993 - 2⁵ = 197187961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (197187923) 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, 14130 + ... + 24372.

It is an arithmetic number, because the mean of its divisors is an integer number (9834240).

Almost surely, 2^197187993 is an apocalyptic number.

It is an amenable number.

197187993 is a deficient number, since it is larger than the sum of its proper divisors (117507687).

197187993 is a wasteful number, since it uses less digits than its factorization.

197187993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306 (or 10300 counting only the distinct ones).

The product of its digits is 857304, while the sum is 54.

The square root of 197187993 is about 14042.3642240187. The cubic root of 197187993 is about 582.0498150580.

The spelling of 197187993 in words is "one hundred ninety-seven million, one hundred eighty-seven thousand, nine hundred ninety-three".