838139903999 has 4 divisors (see below), whose sum is σ = 846780521664. Its totient is φ = 829499286336.

The previous prime is 838139903977. The next prime is 838139904001. The reversal of 838139903999 is 999309931838.

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 838139903999 - 2²⁸ = 837871468543 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 (838139906999) 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, 4320308687 + ... + 4320308880.

It is an arithmetic number, because the mean of its divisors is an integer number (211695130416).

Almost surely, 2^838139903999 is an apocalyptic number.

838139903999 is a deficient number, since it is larger than the sum of its proper divisors (8640617665).

838139903999 is an equidigital number, since it uses as much as digits as its factorization.

838139903999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8640617664.

The product of its (nonzero) digits is 102036672, while the sum is 71.

The spelling of 838139903999 in words is "eight hundred thirty-eight billion, one hundred thirty-nine million, nine hundred three thousand, nine hundred ninety-nine".