216440403 has 8 divisors (see below), whose sum is σ = 288724416. Its totient is φ = 144225000.

The previous prime is 216440387. The next prime is 216440407. The reversal of 216440403 is 304044612.

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

It is not a de Polignac number, because 216440403 - 2⁴ = 216440387 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (216440407) 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, 9273 + ... + 22778.

It is an arithmetic number, because the mean of its divisors is an integer number (36090552).

Almost surely, 2^216440403 is an apocalyptic number.

216440403 is a deficient number, since it is larger than the sum of its proper divisors (72284013).

216440403 is a wasteful number, since it uses less digits than its factorization.

216440403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34305.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 216440403 is about 14711.9136416715. The cubic root of 216440403 is about 600.4075037274.

The spelling of 216440403 in words is "two hundred sixteen million, four hundred forty thousand, four hundred three".