2809988 has 6 divisors (see below), whose sum is σ = 4917486. Its totient is φ = 1404992.

The previous prime is 2809987. The next prime is 2810009. The reversal of 2809988 is 8899082.

It can be written as a sum of positive squares in only one way, i.e., 2166784 + 643204 = 1472^2 + 802^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 351245 + ... + 351252.

It is an arithmetic number, because the mean of its divisors is an integer number (819581).

2^2809988 is an apocalyptic number.

It is an amenable number.

2809988 is a deficient number, since it is larger than the sum of its proper divisors (2107498).

2809988 is a wasteful number, since it uses less digits than its factorization.

2809988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702501 (or 702499 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 2809988 is about 1676.3018821203. The cubic root of 2809988 is about 141.1133672366.

The spelling of 2809988 in words is "two million, eight hundred nine thousand, nine hundred eighty-eight".