3540721 has 2 divisors, whose sum is σ = 3540722. Its totient is φ = 3540720.

The previous prime is 3540703. The next prime is 3540763. The reversal of 3540721 is 1270453.

3540721 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., 3111696 + 429025 = 1764^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 3540721 - 2¹¹ = 3538673 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3540692 and 3540701.

It is not a weakly prime, because it can be changed into another prime (3540421) 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, 1770360 + 1770361.

It is an arithmetic number, because the mean of its divisors is an integer number (1770361).

Almost surely, 2^3540721 is an apocalyptic number.

It is an amenable number.

3540721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3540721 is an equidigital number, since it uses as much as digits as its factorization.

3540721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 3540721 is about 1881.6803660558. The cubic root of 3540721 is about 152.4160031922.

The spelling of 3540721 in words is "three million, five hundred forty thousand, seven hundred twenty-one".