16238809 has 2 divisors, whose sum is σ = 16238810. Its totient is φ = 16238808.

The previous prime is 16238801. The next prime is 16238813. The reversal of 16238809 is 90883261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 278784 = 3995^2 + 528^2 .

It is a cyclic number.

It is not a de Polignac number, because 16238809 - 2³ = 16238801 is a prime.

It is not a weakly prime, because it can be changed into another prime (16238801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8119404 + 8119405.

It is an arithmetic number, because the mean of its divisors is an integer number (8119405).

Almost surely, 2^16238809 is an apocalyptic number.

It is an amenable number.

16238809 is a deficient number, since it is larger than the sum of its proper divisors (1).

16238809 is an equidigital number, since it uses as much as digits as its factorization.

16238809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 16238809 is about 4029.7405623687. The cubic root of 16238809 is about 253.2316926438.

The spelling of 16238809 in words is "sixteen million, two hundred thirty-eight thousand, eight hundred nine".