2887639 has 8 divisors (see below), whose sum is σ = 3055280. Its totient is φ = 2729160.

The previous prime is 2887631. The next prime is 2887649. The reversal of 2887639 is 9367882.

It is not a de Polignac number, because 2887639 - 2³ = 2887631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2887595 and 2887604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2887631) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6649 + ... + 7069.

It is an arithmetic number, because the mean of its divisors is an integer number (381910).

2^2887639 is an apocalyptic number.

2887639 is a deficient number, since it is larger than the sum of its proper divisors (167641).

2887639 is an frugal number, since it uses more digits than its factorization.

2887639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478 (or 440 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 2887639 is about 1699.3054463515. The cubic root of 2887639 is about 142.4014132913.

The spelling of 2887639 in words is "two million, eight hundred eighty-seven thousand, six hundred thirty-nine".