671940 has 36 divisors (see below), whose sum is σ = 2038764. Its totient is φ = 179136.

The previous prime is 671939. The next prime is 671941. The reversal of 671940 is 49176.

It is an interprime number because it is at equal distance from previous prime (671939) and next prime (671941).

It can be written as a sum of positive squares in 2 ways, for example, as 304704 + 367236 = 552^2 + 606^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (671941) 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, 1687 + ... + 2046.

2⁶⁷¹⁹⁴⁰ is an apocalyptic number.

671940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

671940 is an abundant number, since it is smaller than the sum of its proper divisors (1366824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671940 is a wasteful number, since it uses less digits than its factorization.

671940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3748 (or 3743 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 671940 is about 819.7194642071. The cubic root of 671940 is about 87.5877758635.

The spelling of 671940 in words is "six hundred seventy-one thousand, nine hundred forty".