671389 has 4 divisors (see below), whose sum is σ = 673056. Its totient is φ = 669724.

The previous prime is 671383. The next prime is 671401. The reversal of 671389 is 983176.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 671389 - 2⁵ = 671357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192 + ... + 1174.

It is an arithmetic number, because the mean of its divisors is an integer number (168264).

2⁶⁷¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

671389 is a deficient number, since it is larger than the sum of its proper divisors (1667).

671389 is an equidigital number, since it uses as much as digits as its factorization.

671389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666.

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

The square root of 671389 is about 819.3833046871. The cubic root of 671389 is about 87.5638282581.

The spelling of 671389 in words is "six hundred seventy-one thousand, three hundred eighty-nine".