3888921 has 8 divisors (see below), whose sum is σ = 5295744. Its totient is φ = 2537360.

The previous prime is 3888917. The next prime is 3888923. The reversal of 3888921 is 1298883.

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 3888921 - 2² = 3888917 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3888921.

It is not an unprimeable number, because it can be changed into a prime (3888923) 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 7 ways as a sum of consecutive naturals, for example, 13650 + ... + 13931.

It is an arithmetic number, because the mean of its divisors is an integer number (661968).

Almost surely, 2^3888921 is an apocalyptic number.

It is an amenable number.

3888921 is a deficient number, since it is larger than the sum of its proper divisors (1406823).

3888921 is a wasteful number, since it uses less digits than its factorization.

3888921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27631.

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

The square root of 3888921 is about 1972.0347360024. The cubic root of 3888921 is about 157.2568988391.

The spelling of 3888921 in words is "three million, eight hundred eighty-eight thousand, nine hundred twenty-one".