214028809 has 4 divisors (see below), whose sum is σ = 217537540. Its totient is φ = 210520080.

The previous prime is 214028779. The next prime is 214028819. The reversal of 214028809 is 908820412.

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 57078025 + 156950784 = 7555^2 + 12528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-214028809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (214028819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1754274 + ... + 1754395.

It is an arithmetic number, because the mean of its divisors is an integer number (54384385).

Almost surely, 2^214028809 is an apocalyptic number.

It is an amenable number.

214028809 is a deficient number, since it is larger than the sum of its proper divisors (3508731).

214028809 is an equidigital number, since it uses as much as digits as its factorization.

214028809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508730.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 214028809 is about 14629.7234765391. The cubic root of 214028809 is about 598.1692427093.

The spelling of 214028809 in words is "two hundred fourteen million, twenty-eight thousand, eight hundred nine".