3828921 has 4 divisors (see below), whose sum is σ = 5105232. Its totient is φ = 2552612.

The previous prime is 3828919. The next prime is 3828931. The reversal of 3828921 is 1298283.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3828921 - 2¹ = 3828919 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3828901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638151 + ... + 638156.

It is an arithmetic number, because the mean of its divisors is an integer number (1276308).

Almost surely, 2^3828921 is an apocalyptic number.

It is an amenable number.

3828921 is a deficient number, since it is larger than the sum of its proper divisors (1276311).

3828921 is a wasteful number, since it uses less digits than its factorization.

3828921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276310.

The product of its digits is 6912, while the sum is 33.

The square root of 3828921 is about 1956.7628880373. The cubic root of 3828921 is about 156.4439605147.

The spelling of 3828921 in words is "three million, eight hundred twenty-eight thousand, nine hundred twenty-one".