1665367 has 4 divisors (see below), whose sum is σ = 1816776. Its totient is φ = 1513960.

The previous prime is 1665343. The next prime is 1665421. The reversal of 1665367 is 7635661.

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 1665367 - 2¹⁵ = 1632599 is a prime.

It is a Duffinian number.

1665367 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665317) 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, 75688 + ... + 75709.

It is an arithmetic number, because the mean of its divisors is an integer number (454194).

2^1665367 is an apocalyptic number.

1665367 is a deficient number, since it is larger than the sum of its proper divisors (151409).

1665367 is a wasteful number, since it uses less digits than its factorization.

1665367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151408.

The product of its digits is 22680, while the sum is 34.

The square root of 1665367 is about 1290.4909918322. The cubic root of 1665367 is about 118.5322836310.

The spelling of 1665367 in words is "one million, six hundred sixty-five thousand, three hundred sixty-seven".