2721445 has 16 divisors (see below), whose sum is σ = 3503088. Its totient is φ = 2022400.

The previous prime is 2721443. The next prime is 2721449. The reversal of 2721445 is 5441272.

2721445 = 1166² + 1167².

It can be written as a sum of positive squares in 8 ways, for example, as 25281 + 2696164 = 159^2 + 1642^2 .

It is not a de Polignac number, because 2721445 - 2¹ = 2721443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2721443) 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, 8427 + ... + 8743.

It is an arithmetic number, because the mean of its divisors is an integer number (218943).

2^2721445 is an apocalyptic number.

2721445 is the 1167-th centered square number.

It is an amenable number.

2721445 is a deficient number, since it is larger than the sum of its proper divisors (781643).

2721445 is a wasteful number, since it uses less digits than its factorization.

2721445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440.

The product of its digits is 2240, while the sum is 25.

The square root of 2721445 is about 1649.6802720527. The cubic root of 2721445 is about 139.6153557381.

The spelling of 2721445 in words is "two million, seven hundred twenty-one thousand, four hundred forty-five".