197908057 has 4 divisors (see below), whose sum is σ = 197936356. Its totient is φ = 197879760.

The previous prime is 197908049. The next prime is 197908063. The reversal of 197908057 is 750809791.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 120538441 + 77369616 = 10979^2 + 8796^2 .

It is a cyclic number.

It is not a de Polignac number, because 197908057 - 2³ = 197908049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 197907998 and 197908016.

It is not an unprimeable number, because it can be changed into a prime (197908157) 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 3 ways as a sum of consecutive naturals, for example, 4807 + ... + 20467.

It is an arithmetic number, because the mean of its divisors is an integer number (49484089).

Almost surely, 2^197908057 is an apocalyptic number.

It is an amenable number.

197908057 is a deficient number, since it is larger than the sum of its proper divisors (28299).

197908057 is a wasteful number, since it uses less digits than its factorization.

197908057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28298.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 197908057 is about 14067.9798478673. The cubic root of 197908057 is about 582.7574375842.

The spelling of 197908057 in words is "one hundred ninety-seven million, nine hundred eight thousand, fifty-seven".