438521856 has 104 divisors (see below), whose sum is σ = 1182649344. Its totient is φ = 144506880.

The previous prime is 438521819. The next prime is 438521857. The reversal of 438521856 is 658125834.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438521857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1560436 + ... + 1560716.

Almost surely, 2^438521856 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 438521856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (591324672).

438521856 is an abundant number, since it is smaller than the sum of its proper divisors (744127488).

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

438521856 is a wasteful number, since it uses less digits than its factorization.

438521856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 413 counting only the distinct ones).

The product of its digits is 230400, while the sum is 42.

The square root of 438521856 is about 20940.9134471255. The cubic root of 438521856 is about 759.7378227712.

The spelling of 438521856 in words is "four hundred thirty-eight million, five hundred twenty-one thousand, eight hundred fifty-six".