3728509 has 2 divisors, whose sum is σ = 3728510. Its totient is φ = 3728508.

The previous prime is 3728489. The next prime is 3728513. The reversal of 3728509 is 9058273.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2722500 + 1006009 = 1650^2 + 1003^2 .

It is a cyclic number.

It is not a de Polignac number, because 3728509 - 2¹¹ = 3726461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3738509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1864254 + 1864255.

It is an arithmetic number, because the mean of its divisors is an integer number (1864255).

Almost surely, 2^3728509 is an apocalyptic number.

It is an amenable number.

3728509 is a deficient number, since it is larger than the sum of its proper divisors (1).

3728509 is an equidigital number, since it uses as much as digits as its factorization.

3728509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 3728509 is about 1930.9347477323. The cubic root of 3728509 is about 155.0642674872.

The spelling of 3728509 in words is "three million, seven hundred twenty-eight thousand, five hundred nine".