2587639 has 2 divisors, whose sum is σ = 2587640. Its totient is φ = 2587638.

The previous prime is 2587609. The next prime is 2587649. The reversal of 2587639 is 9367852.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2587639 - 2⁹ = 2587127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2587609) 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 as a sum of consecutive naturals, namely, 1293819 + 1293820.

It is an arithmetic number, because the mean of its divisors is an integer number (1293820).

2^2587639 is an apocalyptic number.

2587639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2587639 is an equidigital number, since it uses as much as digits as its factorization.

2587639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 2587639 is about 1608.6139996904. The cubic root of 2587639 is about 137.2886272987.

The spelling of 2587639 in words is "two million, five hundred eighty-seven thousand, six hundred thirty-nine".