2733721 has 4 divisors (see below), whose sum is σ = 2739472. Its totient is φ = 2727972.

The previous prime is 2733707. The next prime is 2733733. The reversal of 2733721 is 1273372.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2733721 - 2¹³ = 2725529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2733781) 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, 2091 + ... + 3136.

It is an arithmetic number, because the mean of its divisors is an integer number (684868).

2^2733721 is an apocalyptic number.

2733721 is the 1046-th heptagonal number.

It is an amenable number.

2733721 is a deficient number, since it is larger than the sum of its proper divisors (5751).

2733721 is an equidigital number, since it uses as much as digits as its factorization.

2733721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5750.

The product of its digits is 1764, while the sum is 25.

The square root of 2733721 is about 1653.3968065773. The cubic root of 2733721 is about 139.8249683369.

The spelling of 2733721 in words is "two million, seven hundred thirty-three thousand, seven hundred twenty-one".