2887391 has 4 divisors (see below), whose sum is σ = 3109512. Its totient is φ = 2665272.

The previous prime is 2887363. The next prime is 2887439. The reversal of 2887391 is 1937882.

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 2887391 - 2¹⁸ = 2625247 is a prime.

It is a super-3 number, since 3×2887391³ = 72216768333597352413, which contains 333 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 (2881391) 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 3 ways as a sum of consecutive naturals, for example, 111041 + ... + 111066.

It is an arithmetic number, because the mean of its divisors is an integer number (777378).

2^2887391 is an apocalyptic number.

2887391 is a deficient number, since it is larger than the sum of its proper divisors (222121).

2887391 is a wasteful number, since it uses less digits than its factorization.

2887391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222120.

The product of its digits is 24192, while the sum is 38.

The square root of 2887391 is about 1699.2324737952. The cubic root of 2887391 is about 142.3973365396.

The spelling of 2887391 in words is "two million, eight hundred eighty-seven thousand, three hundred ninety-one".