16649797 has 4 divisors (see below), whose sum is σ = 17004096. Its totient is φ = 16295500.

The previous prime is 16649779. The next prime is 16649807. The reversal of 16649797 is 79794661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16649797 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16649797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16649197) 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, 177079 + ... + 177172.

It is an arithmetic number, because the mean of its divisors is an integer number (4251024).

Almost surely, 2^16649797 is an apocalyptic number.

It is an amenable number.

16649797 is a deficient number, since it is larger than the sum of its proper divisors (354299).

16649797 is an equidigital number, since it uses as much as digits as its factorization.

16649797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354298.

The product of its digits is 571536, while the sum is 49.

The square root of 16649797 is about 4080.4162777834. The cubic root of 16649797 is about 255.3502658061.

The spelling of 16649797 in words is "sixteen million, six hundred forty-nine thousand, seven hundred ninety-seven".