197983907 has 4 divisors (see below), whose sum is σ = 215982456. Its totient is φ = 179985360.

The previous prime is 197983897. The next prime is 197983913. The reversal of 197983907 is 709389791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 197983907 - 2⁶ = 197983843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197983927) 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, 8999258 + ... + 8999279.

It is an arithmetic number, because the mean of its divisors is an integer number (53995614).

Almost surely, 2^197983907 is an apocalyptic number.

197983907 is a deficient number, since it is larger than the sum of its proper divisors (17998549).

197983907 is a wasteful number, since it uses less digits than its factorization.

197983907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17998548.

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 197983907 is about 14070.6754279956. The cubic root of 197983907 is about 582.8318770429.

The spelling of 197983907 in words is "one hundred ninety-seven million, nine hundred eighty-three thousand, nine hundred seven".