197813 has 12 divisors (see below), whose sum is σ = 251712. Its totient is φ = 153720.

The previous prime is 197807. The next prime is 197831. The reversal of 197813 is 318791.

It is a de Polignac number, because none of the positive numbers 2^k-197813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 356 + ... + 722.

It is an arithmetic number, because the mean of its divisors is an integer number (20976).

2¹⁹⁷⁸¹³ is an apocalyptic number.

It is an amenable number.

197813 is a deficient number, since it is larger than the sum of its proper divisors (53899).

197813 is a wasteful number, since it uses less digits than its factorization.

197813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 385 counting only the distinct ones).

The product of its digits is 1512, while the sum is 29.

The square root of 197813 is about 444.7617339655. The cubic root of 197813 is about 58.2664121449.

It can be divided in two parts, 1978 and 13, that added together give a palindrome (1991).

The spelling of 197813 in words is "one hundred ninety-seven thousand, eight hundred thirteen".