438032640 has 144 divisors (see below), whose sum is σ = 1437242688. Its totient is φ = 113614848.

The previous prime is 438032633. The next prime is 438032653. The reversal of 438032640 is 46230834.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 438032598 and 438032607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140539 + ... + 143621.

It is an arithmetic number, because the mean of its divisors is an integer number (9980852).

Almost surely, 2^438032640 is an apocalyptic number.

438032640 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 438032640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (718621344).

438032640 is an abundant number, since it is smaller than the sum of its proper divisors (999210048).

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

438032640 is a wasteful number, since it uses less digits than its factorization.

438032640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144 (or 3130 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 438032640 is about 20929.2293216927. The cubic root of 438032640 is about 759.4551958861.

The spelling of 438032640 in words is "four hundred thirty-eight million, thirty-two thousand, six hundred forty".