197865 has 12 divisors (see below), whose sum is σ = 343044. Its totient is φ = 105504.

The previous prime is 197837. The next prime is 197887. The reversal of 197865 is 568791.

197865 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 82944 + 114921 = 288^2 + 339^2 .

It is not a de Polignac number, because 197865 - 2⁸ = 197609 is a prime.

197865 is strictly pandigital in base 7.

197865 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2154 + ... + 2243.

It is an arithmetic number, because the mean of its divisors is an integer number (28587).

2¹⁹⁷⁸⁶⁵ is an apocalyptic number.

197865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

197865 is a deficient number, since it is larger than the sum of its proper divisors (145179).

197865 is a wasteful number, since it uses less digits than its factorization.

197865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4408 (or 4405 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 197865 is about 444.8201883908. The cubic root of 197865 is about 58.2715172829.

It can be divided in two parts, 19786 and 5, that added together give a palindrome (19791).

The spelling of 197865 in words is "one hundred ninety-seven thousand, eight hundred sixty-five".