3831280921 has 8 divisors (see below), whose sum is σ = 4237508744. Its totient is φ = 3440983680.

The previous prime is 3831280909. The next prime is 3831280927. The reversal of 3831280921 is 1290821383.

3831280921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7590025 + 3823690896 = 2755^2 + 61836^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3831280921 - 2²¹ = 3829183769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3831280927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3982140 + ... + 3983101.

It is an arithmetic number, because the mean of its divisors is an integer number (529688593).

Almost surely, 2^3831280921 is an apocalyptic number.

It is an amenable number.

3831280921 is a deficient number, since it is larger than the sum of its proper divisors (406227823).

3831280921 is a wasteful number, since it uses less digits than its factorization.

3831280921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7965291.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 3831280921 is about 61897.3417926812. The cubic root of 3831280921 is about 1564.7609485606.

The spelling of 3831280921 in words is "three billion, eight hundred thirty-one million, two hundred eighty thousand, nine hundred twenty-one".