16603945 has 8 divisors (see below), whose sum is σ = 19951560. Its totient is φ = 13265280.

The previous prime is 16603943. The next prime is 16603949. The reversal of 16603945 is 54930661.

It can be written as a sum of positive squares in 4 ways, for example, as 346921 + 16257024 = 589^2 + 4032^2 .

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

It is not a de Polignac number, because 16603945 - 2¹ = 16603943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16603945.

It is not an unprimeable number, because it can be changed into a prime (16603943) 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, 2941 + ... + 6469.

It is an arithmetic number, because the mean of its divisors is an integer number (2493945).

Almost surely, 2^16603945 is an apocalyptic number.

It is an amenable number.

16603945 is a deficient number, since it is larger than the sum of its proper divisors (3347615).

16603945 is an equidigital number, since it uses as much as digits as its factorization.

16603945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4475.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 16603945 is about 4074.7938598167. The cubic root of 16603945 is about 255.1156466345.

The spelling of 16603945 in words is "sixteen million, six hundred three thousand, nine hundred forty-five".