3921998 has 8 divisors (see below), whose sum is σ = 5963808. Its totient is φ = 1934064.

The previous prime is 3921997. The next prime is 3922003. The reversal of 3921998 is 8991293.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3921991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13286 + ... + 13577.

It is an arithmetic number, because the mean of its divisors is an integer number (745476).

Almost surely, 2^3921998 is an apocalyptic number.

3921998 is a deficient number, since it is larger than the sum of its proper divisors (2041810).

3921998 is a wasteful number, since it uses less digits than its factorization.

3921998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26938.

The product of its digits is 34992, while the sum is 41.

The square root of 3921998 is about 1980.4034942405. The cubic root of 3921998 is about 157.7014873224.

The spelling of 3921998 in words is "three million, nine hundred twenty-one thousand, nine hundred ninety-eight".