2721843 has 24 divisors (see below), whose sum is σ = 4263168. Its totient is φ = 1732104.

The previous prime is 2721841. The next prime is 2721863. The reversal of 2721843 is 3481272.

It is not a de Polignac number, because 2721843 - 2¹ = 2721841 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

2721843 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2721841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5346 + ... + 5832.

It is an arithmetic number, because the mean of its divisors is an integer number (177632).

2^2721843 is an apocalyptic number.

2721843 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2721843 is a deficient number, since it is larger than the sum of its proper divisors (1541325).

2721843 is an equidigital number, since it uses as much as digits as its factorization.

2721843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525 (or 513 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 2721843 is about 1649.8008970782. The cubic root of 2721843 is about 139.6221614612.

It can be divided in two parts, 27218 and 43, that added together give a triangular number (27261 = T₂₃₃).

The spelling of 2721843 in words is "two million, seven hundred twenty-one thousand, eight hundred forty-three".