16327909 has 4 divisors (see below), whose sum is σ = 17583916. Its totient is φ = 15071904.

The previous prime is 16327903. The next prime is 16327943. The reversal of 16327909 is 90972361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4937284 + 11390625 = 2222^2 + 3375^2 .

It is a cyclic number.

It is not a de Polignac number, because 16327909 - 2⁵ = 16327877 is a prime.

It is a super-2 number, since 2×16327909² = 533201224624562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16327903) 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 in 3 ways as a sum of consecutive naturals, for example, 627984 + ... + 628009.

It is an arithmetic number, because the mean of its divisors is an integer number (4395979).

Almost surely, 2^16327909 is an apocalyptic number.

It is an amenable number.

16327909 is a deficient number, since it is larger than the sum of its proper divisors (1256007).

16327909 is a wasteful number, since it uses less digits than its factorization.

16327909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256006.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 16327909 is about 4040.7807413914. The cubic root of 16327909 is about 253.6939967165.

The spelling of 16327909 in words is "sixteen million, three hundred twenty-seven thousand, nine hundred nine".