2887981 has 8 divisors (see below), whose sum is σ = 3073280. Its totient is φ = 2706048.

The previous prime is 2887979. The next prime is 2887987. The reversal of 2887981 is 1897882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2887981 - 2¹ = 2887979 is a prime.

It is a super-2 number, since 2×2887981² = 16680868512722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2887987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060 + ... + 2626.

It is an arithmetic number, because the mean of its divisors is an integer number (384160).

2^2887981 is an apocalyptic number.

It is an amenable number.

2887981 is a deficient number, since it is larger than the sum of its proper divisors (185299).

2887981 is a wasteful number, since it uses less digits than its factorization.

2887981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683.

The product of its digits is 64512, while the sum is 43.

The square root of 2887981 is about 1699.4060727207. The cubic root of 2887981 is about 142.4070348805.

Subtracting from 2887981 its reverse (1897882), we obtain a palindrome (990099).

The spelling of 2887981 in words is "two million, eight hundred eighty-seven thousand, nine hundred eighty-one".