671739 has 12 divisors (see below), whose sum is σ = 929448. Its totient is φ = 431520.

The previous prime is 671729. The next prime is 671743. The reversal of 671739 is 937176.

It is not a de Polignac number, because 671739 - 2¹² = 667643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2767 + ... + 2999.

It is an arithmetic number, because the mean of its divisors is an integer number (77454).

2⁶⁷¹⁷³⁹ is an apocalyptic number.

671739 is a deficient number, since it is larger than the sum of its proper divisors (257709).

671739 is a wasteful number, since it uses less digits than its factorization.

671739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 267 counting only the distinct ones).

The product of its digits is 7938, while the sum is 33.

The square root of 671739 is about 819.5968521169. The cubic root of 671739 is about 87.5790415030.

The spelling of 671739 in words is "six hundred seventy-one thousand, seven hundred thirty-nine".