3876921 has 6 divisors (see below), whose sum is σ = 5600010. Its totient is φ = 2584608.

The previous prime is 3876913. The next prime is 3876937. The reversal of 3876921 is 1296783.

3876921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2134521 + 1742400 = 1461^2 + 1320^2 .

It is not a de Polignac number, because 3876921 - 2³ = 3876913 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (3876941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215376 + ... + 215393.

It is an arithmetic number, because the mean of its divisors is an integer number (933335).

Almost surely, 2^3876921 is an apocalyptic number.

It is an amenable number.

3876921 is a deficient number, since it is larger than the sum of its proper divisors (1723089).

3876921 is a wasteful number, since it uses less digits than its factorization.

3876921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430775 (or 430772 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 3876921 is about 1968.9898425335. The cubic root of 3876921 is about 157.0949835671.

The spelling of 3876921 in words is "three million, eight hundred seventy-six thousand, nine hundred twenty-one".