16603393 has 4 divisors (see below), whose sum is σ = 16774660. Its totient is φ = 16432128.

The previous prime is 16603387. The next prime is 16603423. The reversal of 16603393 is 39330661.

16603393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is the 1664-th star number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39330661 = 31 ⋅1268731.

It can be written as a sum of positive squares in 2 ways, for example, as 4297329 + 12306064 = 2073^2 + 3508^2 .

It is a cyclic number.

It is not a de Polignac number, because 16603393 - 2¹⁷ = 16472321 is a prime.

It is a super-2 number, since 2×16603393² = 551345318224898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16603313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85488 + ... + 85681.

It is an arithmetic number, because the mean of its divisors is an integer number (4193665).

Almost surely, 2^16603393 is an apocalyptic number.

It is an amenable number.

16603393 is a deficient number, since it is larger than the sum of its proper divisors (171267).

16603393 is an equidigital number, since it uses as much as digits as its factorization.

16603393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171266.

The product of its (nonzero) digits is 8748, while the sum is 31.

The square root of 16603393 is about 4074.7261257660. The cubic root of 16603393 is about 255.1128194872.

The spelling of 16603393 in words is "sixteen million, six hundred three thousand, three hundred ninety-three".