3889821 has 16 divisors (see below), whose sum is σ = 5914944. Its totient is φ = 2252544.

The previous prime is 3889817. The next prime is 3889843. The reversal of 3889821 is 1289883.

It is not a de Polignac number, because 3889821 - 2² = 3889817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3889821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3889801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2271 + ... + 3596.

It is an arithmetic number, because the mean of its divisors is an integer number (369684).

Almost surely, 2^3889821 is an apocalyptic number.

It is an amenable number.

3889821 is a deficient number, since it is larger than the sum of its proper divisors (2025123).

3889821 is a wasteful number, since it uses less digits than its factorization.

3889821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5900.

The product of its digits is 27648, while the sum is 39.

The square root of 3889821 is about 1972.2629135082. The cubic root of 3889821 is about 157.2690290497.

The spelling of 3889821 in words is "three million, eight hundred eighty-nine thousand, eight hundred twenty-one".