671979 has 16 divisors (see below), whose sum is σ = 1117440. Its totient is φ = 348960.

The previous prime is 671971. The next prime is 671981. The reversal of 671979 is 979176.

It is not a de Polignac number, because 671979 - 2³ = 671971 is a prime.

671979 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (671971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1224 + ... + 1685.

It is an arithmetic number, because the mean of its divisors is an integer number (69840).

2⁶⁷¹⁹⁷⁹ is an apocalyptic number.

671979 is a deficient number, since it is larger than the sum of its proper divisors (445461).

671979 is a wasteful number, since it uses less digits than its factorization.

671979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2930.

The product of its digits is 23814, while the sum is 39.

The square root of 671979 is about 819.7432524882. The cubic root of 671979 is about 87.5894703884.

The spelling of 671979 in words is "six hundred seventy-one thousand, nine hundred seventy-nine".