2809220842 has 4 divisors (see below), whose sum is σ = 4213831266. Its totient is φ = 1404610420.

The previous prime is 2809220833. The next prime is 2809220849. The reversal of 2809220842 is 2480229082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2325264841 + 483956001 = 48221^2 + 21999^2 .

It is not an unprimeable number, because it can be changed into a prime (2809220849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 702305209 + ... + 702305212.

Almost surely, 2^2809220842 is an apocalyptic number.

2809220842 is a deficient number, since it is larger than the sum of its proper divisors (1404610424).

2809220842 is a wasteful number, since it uses less digits than its factorization.

2809220842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404610423.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 2809220842 is about 53002.0833741467. The cubic root of 2809220842 is about 1411.0052422779.

The spelling of 2809220842 in words is "two billion, eight hundred nine million, two hundred twenty thousand, eight hundred forty-two".