3821998 has 4 divisors (see below), whose sum is σ = 5733000. Its totient is φ = 1910998.

The previous prime is 3821981. The next prime is 3822017. The reversal of 3821998 is 8991283.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 3821998.

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, 955498 + ... + 955501.

It is an arithmetic number, because the mean of its divisors is an integer number (1433250).

Almost surely, 2^3821998 is an apocalyptic number.

3821998 is a deficient number, since it is larger than the sum of its proper divisors (1911002).

3821998 is a wasteful number, since it uses less digits than its factorization.

3821998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911001.

The product of its digits is 31104, while the sum is 40.

The square root of 3821998 is about 1954.9930946170. The cubic root of 3821998 is about 156.3496158373.

The spelling of 3821998 in words is "three million, eight hundred twenty-one thousand, nine hundred ninety-eight".