2704921 has 4 divisors (see below), whose sum is σ = 2864052. Its totient is φ = 2545792.

The previous prime is 2704909. The next prime is 2704927. The reversal of 2704921 is 1294072.

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 1177225 + 1527696 = 1085^2 + 1236^2 .

It is a cyclic number.

It is not a de Polignac number, because 2704921 - 2²¹ = 607769 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (2704927) 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, 79540 + ... + 79573.

It is an arithmetic number, because the mean of its divisors is an integer number (716013).

2^2704921 is an apocalyptic number.

It is an amenable number.

2704921 is a deficient number, since it is larger than the sum of its proper divisors (159131).

2704921 is a wasteful number, since it uses less digits than its factorization.

2704921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159130.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 2704921 is about 1644.6644034574. The cubic root of 2704921 is about 139.3322109192.

Adding to 2704921 its reverse (1294072), we get a palindrome (3998993).

The spelling of 2704921 in words is "two million, seven hundred four thousand, nine hundred twenty-one".