1660671 has 12 divisors (see below), whose sum is σ = 2464072. Its totient is φ = 1076976.

The previous prime is 1660667. The next prime is 1660691. The reversal of 1660671 is 1760661.

It is not a de Polignac number, because 1660671 - 2² = 1660667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660601) 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, 2161 + ... + 2826.

2^1660671 is an apocalyptic number.

1660671 is a deficient number, since it is larger than the sum of its proper divisors (803401).

1660671 is a wasteful number, since it uses less digits than its factorization.

1660671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5030 (or 5027 counting only the distinct ones).

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

The square root of 1660671 is about 1288.6702448648. The cubic root of 1660671 is about 118.4207663463.

The spelling of 1660671 in words is "one million, six hundred sixty thousand, six hundred seventy-one".