3728561 has 2 divisors, whose sum is σ = 3728562. Its totient is φ = 3728560.

The previous prime is 3728537. The next prime is 3728591. The reversal of 3728561 is 1658273.

It is a happy number.

3728561 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., 2560000 + 1168561 = 1600^2 + 1081^2 .

It is an emirp because it is prime and its reverse (1658273) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3728561 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3728591) 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, 1864280 + 1864281.

It is an arithmetic number, because the mean of its divisors is an integer number (1864281).

Almost surely, 2^3728561 is an apocalyptic number.

It is an amenable number.

3728561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3728561 is an equidigital number, since it uses as much as digits as its factorization.

3728561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 3728561 is about 1930.9482126665. The cubic root of 3728561 is about 155.0649883566.

The spelling of 3728561 in words is "three million, seven hundred twenty-eight thousand, five hundred sixty-one".