216404453 has 8 divisors (see below), whose sum is σ = 222442272. Its totient is φ = 210376656.

The previous prime is 216404443. The next prime is 216404473. The reversal of 216404453 is 354404612.

216404453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 216404453 - 2⁸ = 216404197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216404443) 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, 69026 + ... + 72092.

It is an arithmetic number, because the mean of its divisors is an integer number (27805284).

Almost surely, 2^216404453 is an apocalyptic number.

It is an amenable number.

216404453 is a deficient number, since it is larger than the sum of its proper divisors (6037819).

216404453 is a wasteful number, since it uses less digits than its factorization.

216404453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 216404453 is about 14710.6917920266. The cubic root of 216404453 is about 600.3742600190.

The spelling of 216404453 in words is "two hundred sixteen million, four hundred four thousand, four hundred fifty-three".