2805539821 has 8 divisors (see below), whose sum is σ = 3213572544. Its totient is φ = 2399317440.

The previous prime is 2805539813. The next prime is 2805539831. The reversal of 2805539821 is 1289355082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2805539821 - 2³ = 2805539813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805539831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449260 + ... + 455461.

It is an arithmetic number, because the mean of its divisors is an integer number (401696568).

Almost surely, 2^2805539821 is an apocalyptic number.

It is an amenable number.

2805539821 is a deficient number, since it is larger than the sum of its proper divisors (408032723).

2805539821 is an equidigital number, since it uses as much as digits as its factorization.

2805539821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905171.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 2805539821 is about 52967.3467430643. The cubic root of 2805539821 is about 1410.3886762769.

It can be divided in two parts, 28055 and 39821, that added together give a palindrome (67876).

The spelling of 2805539821 in words is "two billion, eight hundred five million, five hundred thirty-nine thousand, eight hundred twenty-one".