406216818 has 24 divisors (see below), whose sum is σ = 1005870528. Its totient is φ = 116061912.

The previous prime is 406216813. The next prime is 406216841. The reversal of 406216818 is 818612604.

It is not an unprimeable number, because it can be changed into a prime (406216813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1611846 + ... + 1612097.

It is an arithmetic number, because the mean of its divisors is an integer number (41911272).

Almost surely, 2^406216818 is an apocalyptic number.

406216818 is an abundant number, since it is smaller than the sum of its proper divisors (599653710).

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

406216818 is a wasteful number, since it uses less digits than its factorization.

406216818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3223958 (or 3223955 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 406216818 is about 20154.8212098247. The cubic root of 406216818 is about 740.6038521334.

The spelling of 406216818 in words is "four hundred six million, two hundred sixteen thousand, eight hundred eighteen".