2785921 has 8 divisors (see below), whose sum is σ = 2957760. Its totient is φ = 2618352.

The previous prime is 2785907. The next prime is 2785961. The reversal of 2785921 is 1295872.

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 2785921 - 2¹¹ = 2783873 is a prime.

It is a super-2 number, since 2×2785921² = 15522711636482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2785901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331 + ... + 2383.

It is an arithmetic number, because the mean of its divisors is an integer number (369720).

2^2785921 is an apocalyptic number.

It is an amenable number.

2785921 is a deficient number, since it is larger than the sum of its proper divisors (171839).

2785921 is a wasteful number, since it uses less digits than its factorization.

2785921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135.

The product of its digits is 10080, while the sum is 34.

The square root of 2785921 is about 1669.1078455271. The cubic root of 2785921 is about 140.7093420628.

The spelling of 2785921 in words is "two million, seven hundred eighty-five thousand, nine hundred twenty-one".