671907 has 4 divisors (see below), whose sum is σ = 895880. Its totient is φ = 447936.

The previous prime is 671903. The next prime is 671911. The reversal of 671907 is 709176.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (671903) and next prime (671911).

It is not a de Polignac number, because 671907 - 2² = 671903 is a prime.

It is a D-number.

It is a Duffinian number.

671907 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (671903) 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, 111982 + ... + 111987.

It is an arithmetic number, because the mean of its divisors is an integer number (223970).

2⁶⁷¹⁹⁰⁷ is an apocalyptic number.

671907 is a deficient number, since it is larger than the sum of its proper divisors (223973).

671907 is a wasteful number, since it uses less digits than its factorization.

671907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223972.

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 671907 is about 819.6993351223. The cubic root of 671907 is about 87.5863419836.

The spelling of 671907 in words is "six hundred seventy-one thousand, nine hundred seven".