3921928 has 8 divisors (see below), whose sum is σ = 7353630. Its totient is φ = 1960960.

The previous prime is 3921919. The next prime is 3921941. The reversal of 3921928 is 8291293.

It can be written as a sum of positive squares in only one way, i.e., 3034564 + 887364 = 1742^2 + 942^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 3921893 and 3921902.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245113 + ... + 245128.

Almost surely, 2^3921928 is an apocalyptic number.

It is an amenable number.

3921928 is a deficient number, since it is larger than the sum of its proper divisors (3431702).

3921928 is a wasteful number, since it uses less digits than its factorization.

3921928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490247 (or 490243 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 3921928 is about 1980.3858209955. The cubic root of 3921928 is about 157.7005490957.

The spelling of 3921928 in words is "three million, nine hundred twenty-one thousand, nine hundred twenty-eight".