438865920 has 156 divisors (see below), whose sum is σ = 1521855036. Its totient is φ = 116981760.

The previous prime is 438865877. The next prime is 438865939. The reversal of 438865920 is 29568834.

It can be written as a sum of positive squares in 2 ways, for example, as 47775744 + 391090176 = 6912^2 + 19776^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183130 + ... + 185510.

It is an arithmetic number, because the mean of its divisors is an integer number (9755481).

Almost surely, 2^438865920 is an apocalyptic number.

438865920 is a gapful number since it is divisible by the number (40) 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 438865920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (760927518).

438865920 is an abundant number, since it is smaller than the sum of its proper divisors (1082989116).

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

438865920 is a wasteful number, since it uses less digits than its factorization.

438865920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2416 (or 2391 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 438865920 is about 20949.1269507825. The cubic root of 438865920 is about 759.9364674500.

The spelling of 438865920 in words is "four hundred thirty-eight million, eight hundred sixty-five thousand, nine hundred twenty".