438666720 has 48 divisors (see below), whose sum is σ = 1381801680. Its totient is φ = 116977664.

The previous prime is 438666707. The next prime is 438666721. The reversal of 438666720 is 27666834.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438666721) 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, 456465 + ... + 457424.

It is an arithmetic number, because the mean of its divisors is an integer number (28787535).

Almost surely, 2^438666720 is an apocalyptic number.

438666720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

438666720 is an abundant number, since it is smaller than the sum of its proper divisors (943134960).

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

438666720 is a wasteful number, since it uses less digits than its factorization.

438666720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913907 (or 913899 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 438666720 is about 20944.3720364207. The cubic root of 438666720 is about 759.8214723784.

The spelling of 438666720 in words is "four hundred thirty-eight million, six hundred sixty-six thousand, seven hundred twenty".