3921668 has 6 divisors (see below), whose sum is σ = 6862926. Its totient is φ = 1960832.

The previous prime is 3921649. The next prime is 3921677. The reversal of 3921668 is 8661293.

It can be written as a sum of positive squares in only one way, i.e., 3161284 + 760384 = 1778^2 + 872^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490205 + ... + 490212.

It is an arithmetic number, because the mean of its divisors is an integer number (1143821).

Almost surely, 2^3921668 is an apocalyptic number.

It is an amenable number.

3921668 is a deficient number, since it is larger than the sum of its proper divisors (2941258).

3921668 is a wasteful number, since it uses less digits than its factorization.

3921668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980421 (or 980419 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 3921668 is about 1980.3201761331. The cubic root of 3921668 is about 157.6970641559.

The spelling of 3921668 in words is "three million, nine hundred twenty-one thousand, six hundred sixty-eight".