2813921 has 8 divisors (see below), whose sum is σ = 3081888. Its totient is φ = 2548000.

The previous prime is 2813917. The next prime is 2813927. The reversal of 2813921 is 1293182.

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 2813921 - 2² = 2813917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2813927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5141 + ... + 5661.

It is an arithmetic number, because the mean of its divisors is an integer number (385236).

2^2813921 is an apocalyptic number.

It is an amenable number.

2813921 is a deficient number, since it is larger than the sum of its proper divisors (267967).

2813921 is a wasteful number, since it uses less digits than its factorization.

2813921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023.

The product of its digits is 864, while the sum is 26.

The square root of 2813921 is about 1677.4745899715. The cubic root of 2813921 is about 141.1791729909.

The spelling of 2813921 in words is "two million, eight hundred thirteen thousand, nine hundred twenty-one".