2687945 has 12 divisors (see below), whose sum is σ = 3493836. Its totient is φ = 1984320.

The previous prime is 2687899. The next prime is 2687953. The reversal of 2687945 is 5497862.

It can be written as a sum of positive squares in 6 ways, for example, as 1157776 + 1530169 = 1076^2 + 1237^2 .

It is not a de Polignac number, because 2687945 - 2¹⁰ = 2686921 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 746 + ... + 2435.

It is an arithmetic number, because the mean of its divisors is an integer number (291153).

2^2687945 is an apocalyptic number.

It is an amenable number.

2687945 is a deficient number, since it is larger than the sum of its proper divisors (805891).

2687945 is a wasteful number, since it uses less digits than its factorization.

2687945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3212 (or 3199 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 2687945 is about 1639.4953491852. The cubic root of 2687945 is about 139.0401174682.

The spelling of 2687945 in words is "two million, six hundred eighty-seven thousand, nine hundred forty-five".