1445213220 has 96 divisors (see below), whose sum is σ = 4486962816. Its totient is φ = 344601600.

The previous prime is 1445213219. The next prime is 1445213227. The reversal of 1445213220 is 223125441.

It is not an unprimeable number, because it can be changed into a prime (1445213227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22312 + ... + 58208.

It is an arithmetic number, because the mean of its divisors is an integer number (46739196).

Almost surely, 2^1445213220 is an apocalyptic number.

1445213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1445213220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2243481408).

1445213220 is an abundant number, since it is smaller than the sum of its proper divisors (3041749596).

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

1445213220 is a wasteful number, since it uses less digits than its factorization.

1445213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35981 (or 35979 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1445213220 is about 38015.9600694235. The cubic root of 1445213220 is about 1130.6043234209.

Adding to 1445213220 its reverse (223125441), we get a palindrome (1668338661).

It can be divided in two parts, 144521 and 3220, that added together give a palindrome (147741).

The spelling of 1445213220 in words is "one billion, four hundred forty-five million, two hundred thirteen thousand, two hundred twenty".