3880821 has 16 divisors (see below), whose sum is σ = 5952128. Its totient is φ = 2203200.

The previous prime is 3880817. The next prime is 3880847. The reversal of 3880821 is 1280883.

It is not a de Polignac number, because 3880821 - 2² = 3880817 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3880801) 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, 3291 + ... + 4311.

It is an arithmetic number, because the mean of its divisors is an integer number (372008).

Almost surely, 2^3880821 is an apocalyptic number.

It is an amenable number.

3880821 is a deficient number, since it is larger than the sum of its proper divisors (2071307).

3880821 is a wasteful number, since it uses less digits than its factorization.

3880821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 3880821 is about 1969.9799491365. The cubic root of 3880821 is about 157.1476426327.

The spelling of 3880821 in words is "three million, eight hundred eighty thousand, eight hundred twenty-one".