2987891 has 4 divisors (see below), whose sum is σ = 3018792. Its totient is φ = 2956992.

The previous prime is 2987863. The next prime is 2987911. The reversal of 2987891 is 1987892.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2987891 - 2⁶ = 2987827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2987821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15305 + ... + 15498.

It is an arithmetic number, because the mean of its divisors is an integer number (754698).

2^2987891 is an apocalyptic number.

2987891 is a deficient number, since it is larger than the sum of its proper divisors (30901).

2987891 is an equidigital number, since it uses as much as digits as its factorization.

2987891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30900.

The product of its digits is 72576, while the sum is 44.

The square root of 2987891 is about 1728.5517059087. The cubic root of 2987891 is about 144.0306486975.

Subtracting from 2987891 its reverse (1987892), we obtain a palindrome (999999).

The spelling of 2987891 in words is "two million, nine hundred eighty-seven thousand, eight hundred ninety-one".