2721969 has 12 divisors (see below), whose sum is σ = 4067700. Its totient is φ = 1751904.

The previous prime is 2721947. The next prime is 2722001. The reversal of 2721969 is 9691272.

It can be written as a sum of positive squares in 2 ways, for example, as 2250000 + 471969 = 1500^2 + 687^2 .

It is not a de Polignac number, because 2721969 - 2⁷ = 2721841 is a prime.

It is a super-2 number, since 2×2721969² = 14818230473922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2721869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4954 + ... + 5475.

It is an arithmetic number, because the mean of its divisors is an integer number (338975).

2^2721969 is an apocalyptic number.

2721969 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2721969 is a deficient number, since it is larger than the sum of its proper divisors (1345731).

2721969 is a wasteful number, since it uses less digits than its factorization.

2721969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10464 (or 10461 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 2721969 is about 1649.8390830623. The cubic root of 2721969 is about 139.6243158986.

The spelling of 2721969 in words is "two million, seven hundred twenty-one thousand, nine hundred sixty-nine".