16209943 has 4 divisors (see below), whose sum is σ = 16291600. Its totient is φ = 16128288.

The previous prime is 16209923. The next prime is 16209953. The reversal of 16209943 is 34990261.

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

It is a cyclic number.

It is not a de Polignac number, because 16209943 - 2⁵ = 16209911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16209899 and 16209908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16209923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40530 + ... + 40927.

It is an arithmetic number, because the mean of its divisors is an integer number (4072900).

Almost surely, 2^16209943 is an apocalyptic number.

16209943 is a deficient number, since it is larger than the sum of its proper divisors (81657).

16209943 is an equidigital number, since it uses as much as digits as its factorization.

16209943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81656.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 16209943 is about 4026.1573491358. The cubic root of 16209943 is about 253.0815559846.

The spelling of 16209943 in words is "sixteen million, two hundred nine thousand, nine hundred forty-three".