2887821 has 12 divisors (see below), whose sum is σ = 4260672. Its totient is φ = 1883976.

The previous prime is 2887817. The next prime is 2887847. The reversal of 2887821 is 1287882.

It is not a de Polignac number, because 2887821 - 2² = 2887817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2887861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2991 + ... + 3836.

It is an arithmetic number, because the mean of its divisors is an integer number (355056).

2^2887821 is an apocalyptic number.

It is an amenable number.

2887821 is a deficient number, since it is larger than the sum of its proper divisors (1372851).

2887821 is a wasteful number, since it uses less digits than its factorization.

2887821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6880 (or 6877 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 2887821 is about 1699.3589967985. The cubic root of 2887821 is about 142.4044049525.

The spelling of 2887821 in words is "two million, eight hundred eighty-seven thousand, eight hundred twenty-one".