2840921 has 4 divisors (see below), whose sum is σ = 3008052. Its totient is φ = 2673792.

The previous prime is 2840917. The next prime is 2840939. The reversal of 2840921 is 1290482.

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 1597696 + 1243225 = 1264^2 + 1115^2 .

It is a cyclic number.

It is not a de Polignac number, because 2840921 - 2² = 2840917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2840911) 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, 83540 + ... + 83573.

It is an arithmetic number, because the mean of its divisors is an integer number (752013).

2^2840921 is an apocalyptic number.

It is an amenable number.

2840921 is a deficient number, since it is larger than the sum of its proper divisors (167131).

2840921 is a wasteful number, since it uses less digits than its factorization.

2840921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167130.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2840921 is about 1685.5031889617. The cubic root of 2840921 is about 141.6292816384.

The spelling of 2840921 in words is "two million, eight hundred forty thousand, nine hundred twenty-one".