438809881988 has 12 divisors (see below), whose sum is σ = 767931671052. Its totient is φ = 219400833120.

The previous prime is 438809881981. The next prime is 438809881999. The reversal of 438809881988 is 889188908834.

It can be written as a sum of positive squares in 2 ways, for example, as 311105141824 + 127704740164 = 557768^2 + 357358^2 .

It is a super-2 number, since 2×438809881988² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (438809881981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780023 + ... + 1219038.

It is an arithmetic number, because the mean of its divisors is an integer number (63994305921).

Almost surely, 2^438809881988 is an apocalyptic number.

It is an amenable number.

438809881988 is a deficient number, since it is larger than the sum of its proper divisors (329121789064).

438809881988 is a wasteful number, since it uses less digits than its factorization.

438809881988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053942 (or 2053940 counting only the distinct ones).

The product of its (nonzero) digits is 254803968, while the sum is 74.

The spelling of 438809881988 in words is "four hundred thirty-eight billion, eight hundred nine million, eight hundred eighty-one thousand, nine hundred eighty-eight".