2587391 has 4 divisors (see below), whose sum is σ = 2591784. Its totient is φ = 2583000.

The previous prime is 2587357. The next prime is 2587399. The reversal of 2587391 is 1937852.

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 2587391 - 2¹⁴ = 2571007 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2587399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1145 + ... + 2546.

It is an arithmetic number, because the mean of its divisors is an integer number (647946).

2^2587391 is an apocalyptic number.

2587391 is a deficient number, since it is larger than the sum of its proper divisors (4393).

2587391 is an equidigital number, since it uses as much as digits as its factorization.

2587391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4392.

The product of its digits is 15120, while the sum is 35.

The square root of 2587391 is about 1608.5369128497. The cubic root of 2587391 is about 137.2842412325.

The spelling of 2587391 in words is "two million, five hundred eighty-seven thousand, three hundred ninety-one".