2587945 has 4 divisors (see below), whose sum is σ = 3105540. Its totient is φ = 2070352.

The previous prime is 2587943. The next prime is 2587957. The reversal of 2587945 is 5497852.

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

It can be written as a sum of positive squares in 2 ways, for example, as 746496 + 1841449 = 864^2 + 1357^2 .

It is a cyclic number.

It is not a de Polignac number, because 2587945 - 2¹ = 2587943 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2587898 and 2587907.

It is not an unprimeable number, because it can be changed into a prime (2587943) 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, 258790 + ... + 258799.

It is an arithmetic number, because the mean of its divisors is an integer number (776385).

2^2587945 is an apocalyptic number.

It is an amenable number.

2587945 is a deficient number, since it is larger than the sum of its proper divisors (517595).

2587945 is an equidigital number, since it uses as much as digits as its factorization.

2587945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517594.

The product of its digits is 100800, while the sum is 40.

The square root of 2587945 is about 1608.7091098144. The cubic root of 2587945 is about 137.2940387521.

The spelling of 2587945 in words is "two million, five hundred eighty-seven thousand, nine hundred forty-five".