2684921 has 4 divisors (see below), whose sum is σ = 2688612. Its totient is φ = 2681232.

The previous prime is 2684917. The next prime is 2684923. The reversal of 2684921 is 1294862.

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 1755625 + 929296 = 1325^2 + 964^2 .

It is a cyclic number.

It is not a de Polignac number, because 2684921 - 2² = 2684917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2684923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350 + ... + 2343.

It is an arithmetic number, because the mean of its divisors is an integer number (672153).

2^2684921 is an apocalyptic number.

It is an amenable number.

2684921 is a deficient number, since it is larger than the sum of its proper divisors (3691).

2684921 is an equidigital number, since it uses as much as digits as its factorization.

2684921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3690.

The product of its digits is 6912, while the sum is 32.

The square root of 2684921 is about 1638.5728546513. The cubic root of 2684921 is about 138.9879567918.

The spelling of 2684921 in words is "two million, six hundred eighty-four thousand, nine hundred twenty-one".