438720885 has 12 divisors (see below), whose sum is σ = 760449612. Its totient is φ = 233984448.

The previous prime is 438720851. The next prime is 438720899. The reversal of 438720885 is 588027834.

438720885 is a `hidden beast` number, since 438 + 7 + 208 + 8 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 116769636 + 321951249 = 10806^2 + 17943^2 .

It is not a de Polignac number, because 438720885 - 2¹⁷ = 438589813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 9749353 = 438720885 / (4 + 3 + 8 + 7 + 2 + 0 + 8 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 438720885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4874632 + ... + 4874721.

It is an arithmetic number, because the mean of its divisors is an integer number (63370801).

Almost surely, 2^438720885 is an apocalyptic number.

438720885 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

438720885 is a deficient number, since it is larger than the sum of its proper divisors (321728727).

438720885 is a wasteful number, since it uses less digits than its factorization.

438720885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9749364 (or 9749361 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 438720885 is about 20945.6650646381. The cubic root of 438720885 is about 759.8527444386.

The spelling of 438720885 in words is "four hundred thirty-eight million, seven hundred twenty thousand, eight hundred eighty-five".