3921838 has 4 divisors (see below), whose sum is σ = 5882760. Its totient is φ = 1960918.

The previous prime is 3921823. The next prime is 3921851. The reversal of 3921838 is 8381293.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980458 + ... + 980461.

It is an arithmetic number, because the mean of its divisors is an integer number (1470690).

Almost surely, 2^3921838 is an apocalyptic number.

3921838 is a deficient number, since it is larger than the sum of its proper divisors (1960922).

3921838 is a wasteful number, since it uses less digits than its factorization.

3921838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960921.

The product of its digits is 10368, while the sum is 34.

The square root of 3921838 is about 1980.3630980202. The cubic root of 3921838 is about 157.6993427878.

The spelling of 3921838 in words is "three million, nine hundred twenty-one thousand, eight hundred thirty-eight".