1366671 has 4 divisors (see below), whose sum is σ = 1822232. Its totient is φ = 911112.

The previous prime is 1366667. The next prime is 1366693. The reversal of 1366671 is 1766631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1766631 = 3 ⋅588877.

It is not a de Polignac number, because 1366671 - 2² = 1366667 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366601) 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, 227776 + ... + 227781.

It is an arithmetic number, because the mean of its divisors is an integer number (455558).

2^1366671 is an apocalyptic number.

1366671 is a deficient number, since it is larger than the sum of its proper divisors (455561).

1366671 is an equidigital number, since it uses as much as digits as its factorization.

1366671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455560.

The product of its digits is 4536, while the sum is 30.

The square root of 1366671 is about 1169.0470478129. The cubic root of 1366671 is about 110.9740220028.

The spelling of 1366671 in words is "one million, three hundred sixty-six thousand, six hundred seventy-one".