197864 has 8 divisors (see below), whose sum is σ = 371010. Its totient is φ = 98928.

The previous prime is 197837. The next prime is 197887. The reversal of 197864 is 468791.

It can be written as a sum of positive squares in only one way, i.e., 195364 + 2500 = 442^2 + 50^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

197864 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12359 + ... + 12374.

2¹⁹⁷⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

197864 is a deficient number, since it is larger than the sum of its proper divisors (173146).

197864 is a wasteful number, since it uses less digits than its factorization.

197864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24739 (or 24735 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 197864 is about 444.8190643396. The cubic root of 197864 is about 58.2714191156.

The spelling of 197864 in words is "one hundred ninety-seven thousand, eight hundred sixty-four".