450001818 has 80 divisors (see below), whose sum is σ = 1164550464. Its totient is φ = 127215360.

The previous prime is 450001817. The next prime is 450001823. The reversal of 450001818 is 818100054.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 450001791 and 450001800.

It is not an unprimeable number, because it can be changed into a prime (450001817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 107953 + ... + 112043.

Almost surely, 2^450001818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 450001818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (582275232).

450001818 is an abundant number, since it is smaller than the sum of its proper divisors (714548646).

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

450001818 is a wasteful number, since it uses less digits than its factorization.

450001818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209 (or 4200 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 450001818 is about 21213.2462862241. The cubic root of 450001818 is about 766.3104643555.

The spelling of 450001818 in words is "four hundred fifty million, one thousand, eight hundred eighteen".