2721860 has 12 divisors (see below), whose sum is σ = 5715948. Its totient is φ = 1088736.

The previous prime is 2721841. The next prime is 2721863. The reversal of 2721860 is 681272.

It can be written as a sum of positive squares in 2 ways, for example, as 806404 + 1915456 = 898^2 + 1384^2 .

It is not an unprimeable number, because it can be changed into a prime (2721863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68027 + ... + 68066.

It is an arithmetic number, because the mean of its divisors is an integer number (476329).

2^2721860 is an apocalyptic number.

2721860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2721860 is an abundant number, since it is smaller than the sum of its proper divisors (2994088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2721860 is a wasteful number, since it uses less digits than its factorization.

2721860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136102 (or 136100 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 2721860 is about 1649.8060492070. The cubic root of 2721860 is about 139.6224521431.

The spelling of 2721860 in words is "two million, seven hundred twenty-one thousand, eight hundred sixty".