16539649 has 8 divisors (see below), whose sum is σ = 19342400. Its totient is φ = 13846896.

The previous prime is 16539643. The next prime is 16539673. The reversal of 16539649 is 94693561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16539649 - 2³ = 16539641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27174 + ... + 27775.

It is an arithmetic number, because the mean of its divisors is an integer number (2417800).

It is a Proth number, since it is equal to 2019 ⋅ 2¹³ + 1 and 2019 < 2¹³.

Almost surely, 2^16539649 is an apocalyptic number.

It is an amenable number.

16539649 is a deficient number, since it is larger than the sum of its proper divisors (2802751).

16539649 is an equidigital number, since it uses as much as digits as its factorization.

16539649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54999.

The product of its digits is 174960, while the sum is 43.

The square root of 16539649 is about 4066.8967284651. The cubic root of 16539649 is about 254.7859231100.

The spelling of 16539649 in words is "sixteen million, five hundred thirty-nine thousand, six hundred forty-nine".