103998999978 has 64 divisors (see below), whose sum is σ = 244983191040. Its totient is φ = 32589849600.

The previous prime is 103998999967. The next prime is 103998999991. The reversal of 103998999978 is 879999899301.

It is a happy number.

103998999978 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 103998999897 and 103998999906.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 744463 + ... + 873053.

It is an arithmetic number, because the mean of its divisors is an integer number (3827862360).

Almost surely, 2^103998999978 is an apocalyptic number.

103998999978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 103998999978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122491595520).

103998999978 is an abundant number, since it is smaller than the sum of its proper divisors (140984191062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

103998999978 is a wasteful number, since it uses less digits than its factorization.

103998999978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129500 (or 129494 counting only the distinct ones).

The product of its (nonzero) digits is 714256704, while the sum is 81.

The spelling of 103998999978 in words is "one hundred three billion, nine hundred ninety-eight million, nine hundred ninety-nine thousand, nine hundred seventy-eight".