2987665 has 8 divisors (see below), whose sum is σ = 3796200. Its totient is φ = 2249472.

The previous prime is 2987659. The next prime is 2987707. The reversal of 2987665 is 5667892.

2987665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1008016 + 1979649 = 1004^2 + 1407^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2987665 - 2¹¹ = 2985617 is a prime.

It is a super-2 number, since 2×2987665² = 17852284304450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17490 + ... + 17659.

It is an arithmetic number, because the mean of its divisors is an integer number (474525).

2^2987665 is an apocalyptic number.

It is an amenable number.

2987665 is a deficient number, since it is larger than the sum of its proper divisors (808535).

2987665 is a wasteful number, since it uses less digits than its factorization.

2987665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35171.

The product of its digits is 181440, while the sum is 43.

The square root of 2987665 is about 1728.4863320258. The cubic root of 2987665 is about 144.0270171787.

The spelling of 2987665 in words is "two million, nine hundred eighty-seven thousand, six hundred sixty-five".