1667671 has 4 divisors (see below), whose sum is σ = 1670632. Its totient is φ = 1664712.

The previous prime is 1667663. The next prime is 1667689. The reversal of 1667671 is 1767661.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1667671 - 2³ = 1667663 is a prime.

It is a super-2 number, since 2×1667671² = 5562253128482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345 + ... + 1858.

It is an arithmetic number, because the mean of its divisors is an integer number (417658).

2^1667671 is an apocalyptic number.

1667671 is a deficient number, since it is larger than the sum of its proper divisors (2961).

1667671 is an equidigital number, since it uses as much as digits as its factorization.

1667671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2960.

The product of its digits is 10584, while the sum is 34.

The square root of 1667671 is about 1291.3833667815. The cubic root of 1667671 is about 118.5869207443.

The spelling of 1667671 in words is "one million, six hundred sixty-seven thousand, six hundred seventy-one".