438280256985 has 32 divisors (see below), whose sum is σ = 714458924928. Its totient is φ = 229386931200.

The previous prime is 438280256971. The next prime is 438280257011. The reversal of 438280256985 is 589652082834.

It is a happy number.

It is not a de Polignac number, because 438280256985 - 2¹⁰ = 438280255961 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1108867 + ... + 1451256.

It is an arithmetic number, because the mean of its divisors is an integer number (22326841404).

Almost surely, 2^438280256985 is an apocalyptic number.

It is an amenable number.

438280256985 is a deficient number, since it is larger than the sum of its proper divisors (276178667943).

438280256985 is a wasteful number, since it uses less digits than its factorization.

438280256985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560345.

The product of its (nonzero) digits is 33177600, while the sum is 60.

The spelling of 438280256985 in words is "four hundred thirty-eight billion, two hundred eighty million, two hundred fifty-six thousand, nine hundred eighty-five".