8438438421505 has 8 divisors (see below), whose sum is σ = 10130126961024. Its totient is φ = 6748083500400.

The previous prime is 8438438421499. The next prime is 8438438421533. The reversal of 8438438421505 is 5051248348348.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8438438421505 - 2¹¹ = 8438438419457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333390681 + ... + 333415990.

It is an arithmetic number, because the mean of its divisors is an integer number (1266265870128).

Almost surely, 2^{8438438421505} is an apocalyptic number.

It is an amenable number.

8438438421505 is a deficient number, since it is larger than the sum of its proper divisors (1691688539519).

8438438421505 is a wasteful number, since it uses less digits than its factorization.

8438438421505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666809207.

The product of its (nonzero) digits is 14745600, while the sum is 55.

The spelling of 8438438421505 in words is "eight trillion, four hundred thirty-eight billion, four hundred thirty-eight million, four hundred twenty-one thousand, five hundred five".