16393309 has 2 divisors, whose sum is σ = 16393310. Its totient is φ = 16393308.

The previous prime is 16393303. The next prime is 16393313. The reversal of 16393309 is 90339361.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12602500 + 3790809 = 3550^2 + 1947^2 .

It is a cyclic number.

It is not a de Polignac number, because 16393309 - 2³ = 16393301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16393301) 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, 8196654 + 8196655.

It is an arithmetic number, because the mean of its divisors is an integer number (8196655).

Almost surely, 2^16393309 is an apocalyptic number.

It is an amenable number.

16393309 is a deficient number, since it is larger than the sum of its proper divisors (1).

16393309 is an equidigital number, since it uses as much as digits as its factorization.

16393309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 34.

The square root of 16393309 is about 4048.8651496438. The cubic root of 16393309 is about 254.0322618000.

The spelling of 16393309 in words is "sixteen million, three hundred ninety-three thousand, three hundred nine".