671897 has 4 divisors (see below), whose sum is σ = 707280. Its totient is φ = 636516.

The previous prime is 671893. The next prime is 671903. The reversal of 671897 is 798176.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 671897 - 2² = 671893 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 671897.

It is not an unprimeable number, because it can be changed into a prime (671893) by changing a digit.

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, 17663 + ... + 17700.

It is an arithmetic number, because the mean of its divisors is an integer number (176820).

2⁶⁷¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

671897 is a deficient number, since it is larger than the sum of its proper divisors (35383).

671897 is a wasteful number, since it uses less digits than its factorization.

671897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35382.

The product of its digits is 21168, while the sum is 38.

The square root of 671897 is about 819.6932353021. The cubic root of 671897 is about 87.5859074652.

The spelling of 671897 in words is "six hundred seventy-one thousand, eight hundred ninety-seven".