15728369 has 2 divisors, whose sum is σ = 15728370. Its totient is φ = 15728368.

The previous prime is 15728341. The next prime is 15728381. The reversal of 15728369 is 96382751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10975969 + 4752400 = 3313^2 + 2180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15728369 is a prime.

It is a super-2 number, since 2×15728369² = 494763182800322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15728309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7864184 + 7864185.

It is an arithmetic number, because the mean of its divisors is an integer number (7864185).

Almost surely, 2^15728369 is an apocalyptic number.

It is an amenable number.

15728369 is a deficient number, since it is larger than the sum of its proper divisors (1).

15728369 is an equidigital number, since it uses as much as digits as its factorization.

15728369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 15728369 is about 3965.9007804029. The cubic root of 15728369 is about 250.5500900493.

The spelling of 15728369 in words is "fifteen million, seven hundred twenty-eight thousand, three hundred sixty-nine".