197638 has 16 divisors (see below), whose sum is σ = 357120. Its totient is φ = 80136.

The previous prime is 197621. The next prime is 197641. The reversal of 197638 is 836791.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106 + ... + 637.

It is an arithmetic number, because the mean of its divisors is an integer number (22320).

2¹⁹⁷⁶³⁸ is an apocalyptic number.

197638 is a deficient number, since it is larger than the sum of its proper divisors (159482).

197638 is a wasteful number, since it uses less digits than its factorization.

197638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771.

The product of its digits is 9072, while the sum is 34.

The square root of 197638 is about 444.5649558838. The cubic root of 197638 is about 58.2492248173.

The spelling of 197638 in words is "one hundred ninety-seven thousand, six hundred thirty-eight".