444421818 has 48 divisors (see below), whose sum is σ = 1015372800. Its totient is φ = 140097600.

The previous prime is 444421811. The next prime is 444421849. The reversal of 444421818 is 818124444.

It is a super-3 number, since 3×444421818³ (a number of 27 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (444421811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 385543 + ... + 386693.

It is an arithmetic number, because the mean of its divisors is an integer number (21153600).

Almost surely, 2^444421818 is an apocalyptic number.

444421818 is an abundant number, since it is smaller than the sum of its proper divisors (570950982).

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

444421818 is a wasteful number, since it uses less digits than its factorization.

444421818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307 (or 2304 counting only the distinct ones).

The product of its digits is 32768, while the sum is 36.

The square root of 444421818 is about 21081.3144277106. The cubic root of 444421818 is about 763.1298777425.

It can be divided in two parts, 4444 and 21818, that added together give a palindrome (26262).

The spelling of 444421818 in words is "four hundred forty-four million, four hundred twenty-one thousand, eight hundred eighteen".