2836921 has 4 divisors (see below), whose sum is σ = 2840292. Its totient is φ = 2833552.

The previous prime is 2836919. The next prime is 2836937. The reversal of 2836921 is 1296382.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1296382 = 2 ⋅648191.

It can be written as a sum of positive squares in 2 ways, for example, as 541696 + 2295225 = 736^2 + 1515^2 .

It is a cyclic number.

It is not a de Polignac number, because 2836921 - 2¹ = 2836919 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2836961) 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, 771 + ... + 2503.

It is an arithmetic number, because the mean of its divisors is an integer number (710073).

2^2836921 is an apocalyptic number.

It is an amenable number.

2836921 is a deficient number, since it is larger than the sum of its proper divisors (3371).

2836921 is a wasteful number, since it uses less digits than its factorization.

2836921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370.

The product of its digits is 5184, while the sum is 31.

The square root of 2836921 is about 1684.3161817189. The cubic root of 2836921 is about 141.5627793529.

The spelling of 2836921 in words is "two million, eight hundred thirty-six thousand, nine hundred twenty-one".