16539645 has 32 divisors (see below), whose sum is σ = 27869184. Its totient is φ = 8360000.

The previous prime is 16539643. The next prime is 16539673. The reversal of 16539645 is 54693561.

It is not a de Polignac number, because 16539645 - 2¹ = 16539643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16539641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65770 + ... + 66020.

It is an arithmetic number, because the mean of its divisors is an integer number (870912).

Almost surely, 2^16539645 is an apocalyptic number.

16539645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16539645 is a deficient number, since it is larger than the sum of its proper divisors (11329539).

16539645 is a wasteful number, since it uses less digits than its factorization.

16539645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473.

The product of its digits is 97200, while the sum is 39.

The square root of 16539645 is about 4066.8962366896. The cubic root of 16539645 is about 254.7859025706.

The spelling of 16539645 in words is "sixteen million, five hundred thirty-nine thousand, six hundred forty-five".