198713657 has 4 divisors (see below), whose sum is σ = 198745680. Its totient is φ = 198681636.

The previous prime is 198713651. The next prime is 198713693. The reversal of 198713657 is 756317891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198713657 - 2¹⁴ = 198697273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198713651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3383 + ... + 20220.

It is an arithmetic number, because the mean of its divisors is an integer number (49686420).

Almost surely, 2^198713657 is an apocalyptic number.

It is an amenable number.

198713657 is a deficient number, since it is larger than the sum of its proper divisors (32023).

198713657 is an equidigital number, since it uses as much as digits as its factorization.

198713657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32022.

The product of its digits is 317520, while the sum is 47.

The square root of 198713657 is about 14096.5831675623. The cubic root of 198713657 is about 583.5470867976.

The spelling of 198713657 in words is "one hundred ninety-eight million, seven hundred thirteen thousand, six hundred fifty-seven".