16021839 has 4 divisors (see below), whose sum is σ = 21362456. Its totient is φ = 10681224.

The previous prime is 16021829. The next prime is 16021849. The reversal of 16021839 is 93812061.

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

It is an interprime number because it is at equal distance from previous prime (16021829) and next prime (16021849).

It is not a de Polignac number, because 16021839 - 2¹¹ = 16019791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16021829) 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, 2670304 + ... + 2670309.

It is an arithmetic number, because the mean of its divisors is an integer number (5340614).

Almost surely, 2^16021839 is an apocalyptic number.

16021839 is a deficient number, since it is larger than the sum of its proper divisors (5340617).

16021839 is an equidigital number, since it uses as much as digits as its factorization.

16021839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5340616.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 16021839 is about 4002.7289441080. The cubic root of 16021839 is about 252.0988054221.

The spelling of 16021839 in words is "sixteen million, twenty-one thousand, eight hundred thirty-nine".