999999999938 has 8 divisors (see below), whose sum is σ = 1502318394432. Its totient is φ = 499227201796.

The previous prime is 999999999937. The next prime is 999999999959. The reversal of 999999999938 is 839999999999.

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

It is not an unprimeable number, because it can be changed into a prime (999999999937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386397470 + ... + 386400057.

It is an arithmetic number, because the mean of its divisors is an integer number (187789799304).

Almost surely, 2^999999999938 is an apocalyptic number.

999999999938 is a deficient number, since it is larger than the sum of its proper divisors (502318394494).

999999999938 is a wasteful number, since it uses less digits than its factorization.

999999999938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772798176.

The product of its digits is 83682825624, while the sum is 101.

It can be divided in two parts, 99999999993 and 8, that added together give a palindrome (100000000001).

The spelling of 999999999938 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred thirty-eight".