521844444 has 288 divisors, whose sum is σ = 1648987200. Its totient is φ = 143700480.

The previous prime is 521844419. The next prime is 521844467. The reversal of 521844444 is 444448125.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 521844399 and 521844408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17994622 + ... + 17994650.

It is an arithmetic number, because the mean of its divisors is an integer number (5725650).

Almost surely, 2^521844444 is an apocalyptic number.

521844444 is a gapful number since it is divisible by the number (54) 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 521844444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (824493600).

521844444 is an abundant number, since it is smaller than the sum of its proper divisors (1127142756).

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

521844444 is a wasteful number, since it uses less digits than its factorization.

521844444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 62 counting only the distinct ones).

The product of its digits is 81920, while the sum is 36.

The square root of 521844444 is about 22843.9148133589. The cubic root of 521844444 is about 805.0947994783.

The spelling of 521844444 in words is "five hundred twenty-one million, eight hundred forty-four thousand, four hundred forty-four".