2729921 has 2 divisors, whose sum is σ = 2729922. Its totient is φ = 2729920.

The previous prime is 2729917. The next prime is 2729957. The reversal of 2729921 is 1299272.

2729921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2146225 + 583696 = 1465^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 2729921 - 2² = 2729917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2749921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364960 + 1364961.

It is an arithmetic number, because the mean of its divisors is an integer number (1364961).

2^2729921 is an apocalyptic number.

It is an amenable number.

2729921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2729921 is an equidigital number, since it uses as much as digits as its factorization.

2729921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 2729921 is about 1652.2472575253. The cubic root of 2729921 is about 139.7601505466.

The spelling of 2729921 in words is "two million, seven hundred twenty-nine thousand, nine hundred twenty-one".