2103729978 has 32 divisors (see below), whose sum is σ = 4839168384. Its totient is φ = 597235392.

The previous prime is 2103729949. The next prime is 2103730001. The reversal of 2103729978 is 8799273012.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 15 ways as a sum of consecutive naturals, for example, 152925 + ... + 166112.

It is an arithmetic number, because the mean of its divisors is an integer number (151224012).

Almost surely, 2^2103729978 is an apocalyptic number.

2103729978 is an abundant number, since it is smaller than the sum of its proper divisors (2735438406).

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

2103729978 is a wasteful number, since it uses less digits than its factorization.

2103729978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319206.

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 2103729978 is about 45866.4362906036. The cubic root of 2103729978 is about 1281.3368962425.

It can be divided in two parts, 21037 and 29978, that added together give a palindrome (51015).

The spelling of 2103729978 in words is "two billion, one hundred three million, seven hundred twenty-nine thousand, nine hundred seventy-eight".