216966403 has 4 divisors (see below), whose sum is σ = 217419840. Its totient is φ = 216512968.

The previous prime is 216966397. The next prime is 216966479. The reversal of 216966403 is 304669612.

It is a happy number.

216966403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216966403 - 2¹³ = 216958211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216966103) 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, 226000 + ... + 226957.

It is an arithmetic number, because the mean of its divisors is an integer number (54354960).

Almost surely, 2^216966403 is an apocalyptic number.

216966403 is a deficient number, since it is larger than the sum of its proper divisors (453437).

216966403 is an equidigital number, since it uses as much as digits as its factorization.

216966403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453436.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 216966403 is about 14729.7794620286. The cubic root of 216966403 is about 600.8934864022.

The spelling of 216966403 in words is "two hundred sixteen million, nine hundred sixty-six thousand, four hundred three".