438523440 has 40 divisors (see below), whose sum is σ = 1359423408. Its totient is φ = 116939520.

The previous prime is 438523433. The next prime is 438523441. The reversal of 438523440 is 44325834.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (438523441) 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, 913351 + ... + 913830.

Almost surely, 2^438523440 is an apocalyptic number.

438523440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

438523440 is an abundant number, since it is smaller than the sum of its proper divisors (920899968).

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

438523440 is a wasteful number, since it uses less digits than its factorization.

438523440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1827197 (or 1827191 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 33.

The square root of 438523440 is about 20940.9512677911. The cubic root of 438523440 is about 759.7387375285.

The spelling of 438523440 in words is "four hundred thirty-eight million, five hundred twenty-three thousand, four hundred forty".