216354404 has 18 divisors (see below), whose sum is σ = 440436150. Its totient is φ = 92723232.

The previous prime is 216354403. The next prime is 216354419. The reversal of 216354404 is 404453612.

216354404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 170250304 + 46104100 = 13048^2 + 6790^2 .

It is not an unprimeable number, because it can be changed into a prime (216354401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 551729 + ... + 552120.

It is an arithmetic number, because the mean of its divisors is an integer number (24468675).

Almost surely, 2^216354404 is an apocalyptic number.

It is an amenable number.

216354404 is an abundant number, since it is smaller than the sum of its proper divisors (224081746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216354404 is a wasteful number, since it uses less digits than its factorization.

216354404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103867 (or 1103858 counting only the distinct ones).

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

The square root of 216354404 is about 14708.9905839932. The cubic root of 216354404 is about 600.3279725425.

The spelling of 216354404 in words is "two hundred sixteen million, three hundred fifty-four thousand, four hundred four".