197639 has 8 divisors (see below), whose sum is σ = 222432. Its totient is φ = 174240.

The previous prime is 197621. The next prime is 197641. The reversal of 197639 is 936791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197639 - 2⁸ = 197383 is a prime.

It is a super-2 number, since 2×197639² = 78122348642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 197599 and 197608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32 + ... + 629.

It is an arithmetic number, because the mean of its divisors is an integer number (27804).

2¹⁹⁷⁶³⁹ is an apocalyptic number.

197639 is a deficient number, since it is larger than the sum of its proper divisors (24793).

197639 is a wasteful number, since it uses less digits than its factorization.

197639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697.

The product of its digits is 10206, while the sum is 35.

The square root of 197639 is about 444.5660805775. The cubic root of 197639 is about 58.2493230594.

The spelling of 197639 in words is "one hundred ninety-seven thousand, six hundred thirty-nine".