2689985 has 8 divisors (see below), whose sum is σ = 3243240. Its totient is φ = 2141824.

The previous prime is 2689979. The next prime is 2689991. The reversal of 2689985 is 5899862.

It is an interprime number because it is at equal distance from previous prime (2689979) and next prime (2689991).

It can be written as a sum of positive squares in 4 ways, for example, as 309136 + 2380849 = 556^2 + 1543^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2689985 is a prime.

It is a Curzon number.

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11 + ... + 2319.

It is an arithmetic number, because the mean of its divisors is an integer number (405405).

2^2689985 is an apocalyptic number.

It is an amenable number.

2689985 is a deficient number, since it is larger than the sum of its proper divisors (553255).

2689985 is a wasteful number, since it uses less digits than its factorization.

2689985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2547.

The product of its digits is 311040, while the sum is 47.

The square root of 2689985 is about 1640.1173738486. The cubic root of 2689985 is about 139.0752831324.

The spelling of 2689985 in words is "two million, six hundred eighty-nine thousand, nine hundred eighty-five".