87843409 has 4 divisors (see below), whose sum is σ = 87863220. Its totient is φ = 87823600.

The previous prime is 87843391. The next prime is 87843449. The reversal of 87843409 is 90434878.

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 34480384 + 53363025 = 5872^2 + 7305^2 .

It is a cyclic number.

It is not a de Polignac number, because 87843409 - 2⁵ = 87843377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87843449) 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, 147 + ... + 13255.

It is an arithmetic number, because the mean of its divisors is an integer number (21965805).

Almost surely, 2^87843409 is an apocalyptic number.

It is an amenable number.

87843409 is a deficient number, since it is larger than the sum of its proper divisors (19811).

87843409 is a wasteful number, since it uses less digits than its factorization.

87843409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19810.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 87843409 is about 9372.4814750417. The cubic root of 87843409 is about 444.5320317217.

The spelling of 87843409 in words is "eighty-seven million, eight hundred forty-three thousand, four hundred nine".