36809021 has 4 divisors (see below), whose sum is σ = 37706844. Its totient is φ = 35911200.

The previous prime is 36809011. The next prime is 36809053. The reversal of 36809021 is 12090863.

36809021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 5112121 + 31696900 = 2261^2 + 5630^2 .

It is a cyclic number.

It is not a de Polignac number, because 36809021 - 2¹⁸ = 36546877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36809011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 448850 + ... + 448931.

It is an arithmetic number, because the mean of its divisors is an integer number (9426711).

Almost surely, 2^36809021 is an apocalyptic number.

It is an amenable number.

36809021 is a deficient number, since it is larger than the sum of its proper divisors (897823).

36809021 is an equidigital number, since it uses as much as digits as its factorization.

36809021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897822.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 36809021 is about 6067.0438435864. The cubic root of 36809021 is about 332.6478766358.

Adding to 36809021 its reverse (12090863), we get a palindrome (48899884).

The spelling of 36809021 in words is "thirty-six million, eight hundred nine thousand, twenty-one".