216402003 has 16 divisors (see below), whose sum is σ = 324990240. Its totient is φ = 142290432.

The previous prime is 216401989. The next prime is 216402007. The reversal of 216402003 is 300204612.

It is a happy number.

216402003 is a `hidden beast` number, since 2 + 1 + 640 + 20 + 0 + 3 = 666.

It is not a de Polignac number, because 216402003 - 2¹³ = 216393811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216402007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52926 + ... + 56867.

It is an arithmetic number, because the mean of its divisors is an integer number (20311890).

Almost surely, 2^216402003 is an apocalyptic number.

216402003 is a deficient number, since it is larger than the sum of its proper divisors (108588237).

216402003 is a wasteful number, since it uses less digits than its factorization.

216402003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109875 (or 109869 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 216402003 is about 14710.6085190246. The cubic root of 216402003 is about 600.3719943194.

Adding to 216402003 its reverse (300204612), we get a palindrome (516606615).

The spelling of 216402003 in words is "two hundred sixteen million, four hundred two thousand, three".