2721945 has 16 divisors (see below), whose sum is σ = 4412160. Its totient is φ = 1432704.

The previous prime is 2721913. The next prime is 2721947. The reversal of 2721945 is 5491272.

It is not a de Polignac number, because 2721945 - 2⁵ = 2721913 is a prime.

It is an Ulam number.

It is a Curzon number.

2721945 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2721947) 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, 37 + ... + 2333.

It is an arithmetic number, because the mean of its divisors is an integer number (275760).

2^2721945 is an apocalyptic number.

It is an amenable number.

2721945 is a deficient number, since it is larger than the sum of its proper divisors (1690215).

2721945 is a wasteful number, since it uses less digits than its factorization.

2721945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384.

The product of its digits is 5040, while the sum is 30.

The square root of 2721945 is about 1649.8318096097. The cubic root of 2721945 is about 139.6239055347.

The spelling of 2721945 in words is "two million, seven hundred twenty-one thousand, nine hundred forty-five".