366809 has 4 divisors (see below), whose sum is σ = 388404. Its totient is φ = 345216.

The previous prime is 366791. The next prime is 366811. The reversal of 366809 is 908663.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 299209 + 67600 = 547^2 + 260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-366809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 366809.

It is not an unprimeable number, because it can be changed into a prime (366829) 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, 10772 + ... + 10805.

It is an arithmetic number, because the mean of its divisors is an integer number (97101).

2³⁶⁶⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

366809 is a deficient number, since it is larger than the sum of its proper divisors (21595).

366809 is a wasteful number, since it uses less digits than its factorization.

366809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21594.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 366809 is about 605.6475872981. The cubic root of 366809 is about 71.5835657172.

The spelling of 366809 in words is "three hundred sixty-six thousand, eight hundred nine".