438378681 has 16 divisors (see below), whose sum is σ = 629987904. Its totient is φ = 269548224.

The previous prime is 438378631. The next prime is 438378737. The reversal of 438378681 is 186873834.

It is not a de Polignac number, because 438378681 - 2¹⁹ = 437854393 is a prime.

It is a super-2 number, since 2×438378681² = 384351735910599522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 438378681.

It is not an unprimeable number, because it can be changed into a prime (438378631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51715 + ... + 59591.

It is an arithmetic number, because the mean of its divisors is an integer number (39374244).

Almost surely, 2^438378681 is an apocalyptic number.

It is an amenable number.

438378681 is a deficient number, since it is larger than the sum of its proper divisors (191609223).

438378681 is a wasteful number, since it uses less digits than its factorization.

438378681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9320.

The product of its digits is 774144, while the sum is 48.

The square root of 438378681 is about 20937.4946208948. The cubic root of 438378681 is about 759.6551303492.

The spelling of 438378681 in words is "four hundred thirty-eight million, three hundred seventy-eight thousand, six hundred eighty-one".