8438438421503 has 4 divisors (see below), whose sum is σ = 8439681019728. Its totient is φ = 8437195823280.

The previous prime is 8438438421499. The next prime is 8438438421533. The reversal of 8438438421503 is 3051248348348.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8438438421503 - 2² = 8438438421499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8438438421533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621288926 + ... + 621302507.

It is an arithmetic number, because the mean of its divisors is an integer number (2109920254932).

Almost surely, 2^{8438438421503} is an apocalyptic number.

8438438421503 is a deficient number, since it is larger than the sum of its proper divisors (1242598225).

8438438421503 is a wasteful number, since it uses less digits than its factorization.

8438438421503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242598224.

The product of its (nonzero) digits is 8847360, while the sum is 53.

The spelling of 8438438421503 in words is "eight trillion, four hundred thirty-eight billion, four hundred thirty-eight million, four hundred twenty-one thousand, five hundred three".