1002021444 has 18 divisors (see below), whose sum is σ = 2532887630. Its totient is φ = 334007136.

The previous prime is 1002021443. The next prime is 1002021479. The reversal of 1002021444 is 4441202001.

1002021444 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., 534164544 + 467856900 = 23112^2 + 21630^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1002021443) 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, 13916929 + ... + 13917000.

Almost surely, 2^1002021444 is an apocalyptic number.

It is an amenable number.

1002021444 is an abundant number, since it is smaller than the sum of its proper divisors (1530866186).

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

1002021444 is a wasteful number, since it uses less digits than its factorization.

1002021444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27833939 (or 27833934 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1002021444 is about 31654.7223017356. The cubic root of 1002021444 is about 1000.6733611497.

Adding to 1002021444 its reverse (4441202001), we get a palindrome (5443223445).

The spelling of 1002021444 in words is "one billion, two million, twenty-one thousand, four hundred forty-four".