3838311823921 has 3 divisors (see below), whose sum is σ = 3838313783083. Its totient is φ = 3838309864760.

The previous prime is 3838311823909. The next prime is 3838311823961. The reversal of 3838311823921 is 1293281138383.

It is a happy number.

The square root of 3838311823921 is 1959161.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3027735721521 + 810576102400 = 1740039^2 + 900320^2 .

It is not a de Polignac number, because 3838311823921 - 2⁵ = 3838311823889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3838311823961) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 979581 + ... + 2938741.

Almost surely, 2^{3838311823921} is an apocalyptic number.

3838311823921 is the 1959161-st square number.

3838311823921 is the 979581-st centered octagonal number.

It is an amenable number.

3838311823921 is a deficient number, since it is larger than the sum of its proper divisors (1959162).

3838311823921 is an frugal number, since it uses more digits than its factorization.

3838311823921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3918322 (or 1959161 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 52.

The spelling of 3838311823921 in words is "three trillion, eight hundred thirty-eight billion, three hundred eleven million, eight hundred twenty-three thousand, nine hundred twenty-one".