450021144 has 128 divisors (see below), whose sum is σ = 1235139840. Its totient is φ = 136077312.

The previous prime is 450021133. The next prime is 450021157. The reversal of 450021144 is 441120054.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 450021144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1982359 + ... + 1982585.

It is an arithmetic number, because the mean of its divisors is an integer number (9649530).

Almost surely, 2^450021144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 450021144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (617569920).

450021144 is an abundant number, since it is smaller than the sum of its proper divisors (785118696).

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

450021144 is a wasteful number, since it uses less digits than its factorization.

450021144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 450021144 is about 21213.7017986018. The cubic root of 450021144 is about 766.3214343142.

Adding to 450021144 its reverse (441120054), we get a palindrome (891141198).

The spelling of 450021144 in words is "four hundred fifty million, twenty-one thousand, one hundred forty-four".