2881818 has 20 divisors (see below), whose sum is σ = 6457770. Its totient is φ = 960552.

The previous prime is 2881799. The next prime is 2881859. The reversal of 2881818 is 8181882.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1656369 + 1225449 = 1287^2 + 1107^2 .

2881818 is a modest number, since divided by 1818 gives 288 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8733 + ... + 9056.

2^2881818 is an apocalyptic number.

2881818 is an abundant number, since it is smaller than the sum of its proper divisors (3575952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2881818 is a wasteful number, since it uses less digits than its factorization.

2881818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17803 (or 17794 counting only the distinct ones).

The product of its digits is 8192, while the sum is 36.

The square root of 2881818 is about 1697.5918237315. The cubic root of 2881818 is about 142.3056630678.

The spelling of 2881818 in words is "two million, eight hundred eighty-one thousand, eight hundred eighteen".