216346403 has 32 divisors (see below), whose sum is σ = 284788224. Its totient is φ = 159478272.

The previous prime is 216346399. The next prime is 216346421. The reversal of 216346403 is 304643612.

It is a cyclic number.

It is not a de Polignac number, because 216346403 - 2² = 216346399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216346433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164876 + ... + 166182.

It is an arithmetic number, because the mean of its divisors is an integer number (8899632).

Almost surely, 2^216346403 is an apocalyptic number.

216346403 is a deficient number, since it is larger than the sum of its proper divisors (68441821).

216346403 is a wasteful number, since it uses less digits than its factorization.

216346403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 216346403 is about 14708.7186049635. The cubic root of 216346403 is about 600.3205722104.

The spelling of 216346403 in words is "two hundred sixteen million, three hundred forty-six thousand, four hundred three".