3921829 has 4 divisors (see below), whose sum is σ = 3948300. Its totient is φ = 3895360.

The previous prime is 3921823. The next prime is 3921851. The reversal of 3921829 is 9281293.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2160900 + 1760929 = 1470^2 + 1327^2 .

It is a cyclic number.

It is not a de Polignac number, because 3921829 - 2¹¹ = 3919781 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3921794 and 3921803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13012 + ... + 13309.

It is an arithmetic number, because the mean of its divisors is an integer number (987075).

Almost surely, 2^3921829 is an apocalyptic number.

It is an amenable number.

3921829 is a deficient number, since it is larger than the sum of its proper divisors (26471).

3921829 is a wasteful number, since it uses less digits than its factorization.

3921829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26470.

The product of its digits is 7776, while the sum is 34.

The square root of 3921829 is about 1980.3608257083. The cubic root of 3921829 is about 157.6992221560.

The spelling of 3921829 in words is "three million, nine hundred twenty-one thousand, eight hundred twenty-nine".