216040003 has 4 divisors (see below), whose sum is σ = 221878960. Its totient is φ = 210201048.

The previous prime is 216039997. The next prime is 216040039. The reversal of 216040003 is 300040612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216040003 - 2¹³ = 216031811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216040073) 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, 2919423 + ... + 2919496.

It is an arithmetic number, because the mean of its divisors is an integer number (55469740).

Almost surely, 2^216040003 is an apocalyptic number.

216040003 is a deficient number, since it is larger than the sum of its proper divisors (5838957).

216040003 is an equidigital number, since it uses as much as digits as its factorization.

216040003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5838956.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 216040003 is about 14698.2993233911. The cubic root of 216040003 is about 600.0370375285.

Adding to 216040003 its reverse (300040612), we get a palindrome (516080615).

The spelling of 216040003 in words is "two hundred sixteen million, forty thousand, three".