3981238923 has 8 divisors (see below), whose sum is σ = 5315563408. Its totient is φ = 2650536864.

The previous prime is 3981238909. The next prime is 3981238951. The reversal of 3981238923 is 3298321893.

It is a happy number.

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

It is not a de Polignac number, because 3981238923 - 2⁹ = 3981238411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981238903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 903040 + ... + 907437.

It is an arithmetic number, because the mean of its divisors is an integer number (664445426).

Almost surely, 2^3981238923 is an apocalyptic number.

3981238923 is a deficient number, since it is larger than the sum of its proper divisors (1334324485).

3981238923 is a wasteful number, since it uses less digits than its factorization.

3981238923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811213.

The product of its digits is 559872, while the sum is 48.

The square root of 3981238923 is about 63097.0595432148. The cubic root of 3981238923 is about 1584.9153823077.

It can be divided in two parts, 398 and 1238923, that added together give a palindrome (1239321).

The spelling of 3981238923 in words is "three billion, nine hundred eighty-one million, two hundred thirty-eight thousand, nine hundred twenty-three".