197816 has 16 divisors (see below), whose sum is σ = 376800. Its totient is φ = 97344.

The previous prime is 197807. The next prime is 197831. The reversal of 197816 is 618791.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 197816.

It is an unprimeable 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 in 3 ways as a sum of consecutive naturals, for example, 476 + ... + 788.

It is an arithmetic number, because the mean of its divisors is an integer number (23550).

2¹⁹⁷⁸¹⁶ is an apocalyptic number.

It is an amenable number.

197816 is a deficient number, since it is larger than the sum of its proper divisors (178984).

197816 is a wasteful number, since it uses less digits than its factorization.

197816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 394 counting only the distinct ones).

The product of its digits is 3024, while the sum is 32.

The square root of 197816 is about 444.7651065450. The cubic root of 197816 is about 58.2667066964.

The spelling of 197816 in words is "one hundred ninety-seven thousand, eight hundred sixteen".