36820409 has 4 divisors (see below), whose sum is σ = 36843300. Its totient is φ = 36797520.

The previous prime is 36820403. The next prime is 36820417. The reversal of 36820409 is 90402863.

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 1155625 + 35664784 = 1075^2 + 5972^2 .

It is a cyclic number.

It is not a de Polignac number, because 36820409 - 2⁸ = 36820153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36820403) 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, 8834 + ... + 12315.

It is an arithmetic number, because the mean of its divisors is an integer number (9210825).

Almost surely, 2^36820409 is an apocalyptic number.

It is an amenable number.

36820409 is a deficient number, since it is larger than the sum of its proper divisors (22891).

36820409 is a wasteful number, since it uses less digits than its factorization.

36820409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22890.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 36820409 is about 6067.9822840875. The cubic root of 36820409 is about 332.6821780409.

The spelling of 36820409 in words is "thirty-six million, eight hundred twenty thousand, four hundred nine".