2721765 has 16 divisors (see below), whose sum is σ = 4375296. Its totient is φ = 1444800.

The previous prime is 2721727. The next prime is 2721767. The reversal of 2721765 is 5671272.

It is not a de Polignac number, because 2721765 - 2⁶ = 2721701 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6100 + ... + 6530.

It is an arithmetic number, because the mean of its divisors is an integer number (273456).

2^2721765 is an apocalyptic number.

It is an amenable number.

2721765 is a deficient number, since it is larger than the sum of its proper divisors (1653531).

2721765 is a wasteful number, since it uses less digits than its factorization.

2721765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860.

The product of its digits is 5880, while the sum is 30.

The square root of 2721765 is about 1649.7772576927. Note that the first 3 decimals coincide. The cubic root of 2721765 is about 139.6208277285.

It can be divided in two parts, 2721 and 765, that added together give a triangular number (3486 = T₈₃).

The spelling of 2721765 in words is "two million, seven hundred twenty-one thousand, seven hundred sixty-five".