16049809 has 4 divisors (see below), whose sum is σ = 16208820. Its totient is φ = 15890800.

The previous prime is 16049807. The next prime is 16049827. The reversal of 16049809 is 90894061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90894061 = 433 ⋅209917.

It can be written as a sum of positive squares in 2 ways, for example, as 8910225 + 7139584 = 2985^2 + 2672^2 .

It is a cyclic number.

It is not a de Polignac number, because 16049809 - 2¹ = 16049807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16049801) 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, 79354 + ... + 79555.

It is an arithmetic number, because the mean of its divisors is an integer number (4052205).

Almost surely, 2^16049809 is an apocalyptic number.

It is an amenable number.

16049809 is a deficient number, since it is larger than the sum of its proper divisors (159011).

16049809 is a wasteful number, since it uses less digits than its factorization.

16049809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159010.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 16049809 is about 4006.2212869486. The cubic root of 16049809 is about 252.2454199767.

The spelling of 16049809 in words is "sixteen million, forty-nine thousand, eight hundred nine".