671439 has 16 divisors (see below), whose sum is σ = 963072. Its totient is φ = 415008.

The previous prime is 671431. The next prime is 671443. The reversal of 671439 is 934176.

It is a happy number.

It is not a de Polignac number, because 671439 - 2³ = 671431 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 671439.

It is not an unprimeable number, because it can be changed into a prime (671431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2422 + ... + 2684.

It is an arithmetic number, because the mean of its divisors is an integer number (60192).

2⁶⁷¹⁴³⁹ is an apocalyptic number.

671439 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

671439 is a deficient number, since it is larger than the sum of its proper divisors (291633).

671439 is a wasteful number, since it uses less digits than its factorization.

671439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326.

The product of its digits is 4536, while the sum is 30.

The square root of 671439 is about 819.4138148701. The cubic root of 671439 is about 87.5660019024.

The spelling of 671439 in words is "six hundred seventy-one thousand, four hundred thirty-nine".