36909821 has 4 divisors (see below), whose sum is σ = 39749052. Its totient is φ = 34070592.

The previous prime is 36909787. The next prime is 36909841. The reversal of 36909821 is 12890963.

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 23145721 + 13764100 = 4811^2 + 3710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36909821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36909841) 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, 1419596 + ... + 1419621.

It is an arithmetic number, because the mean of its divisors is an integer number (9937263).

Almost surely, 2^36909821 is an apocalyptic number.

It is an amenable number.

36909821 is a deficient number, since it is larger than the sum of its proper divisors (2839231).

36909821 is a wasteful number, since it uses less digits than its factorization.

36909821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2839230.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 36909821 is about 6075.3453399786. The cubic root of 36909821 is about 332.9512474206.

The spelling of 36909821 in words is "thirty-six million, nine hundred nine thousand, eight hundred twenty-one".