84201809 has 4 divisors (see below), whose sum is σ = 84452004. Its totient is φ = 83951616.

The previous prime is 84201763. The next prime is 84201829. The reversal of 84201809 is 90810248.

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 41886784 + 42315025 = 6472^2 + 6505^2 .

It is a cyclic number.

It is not a de Polignac number, because 84201809 - 2⁸ = 84201553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84201829) 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, 124592 + ... + 125265.

It is an arithmetic number, because the mean of its divisors is an integer number (21113001).

Almost surely, 2^84201809 is an apocalyptic number.

It is an amenable number.

84201809 is a deficient number, since it is larger than the sum of its proper divisors (250195).

84201809 is a wasteful number, since it uses less digits than its factorization.

84201809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250194.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 84201809 is about 9176.1543687974. The cubic root of 84201809 is about 438.3023582456.

The spelling of 84201809 in words is "eighty-four million, two hundred one thousand, eight hundred nine".