3998155 has 12 divisors (see below), whose sum is σ = 5581440. Its totient is φ = 2741424.

The previous prime is 3998131. The next prime is 3998171. The reversal of 3998155 is 5518993.

3998155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3998155 - 2¹¹ = 3996107 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7915 + ... + 8404.

It is an arithmetic number, because the mean of its divisors is an integer number (465120).

Almost surely, 2^3998155 is an apocalyptic number.

3998155 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3998155 is a deficient number, since it is larger than the sum of its proper divisors (1583285).

3998155 is a wasteful number, since it uses less digits than its factorization.

3998155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16338 (or 16331 counting only the distinct ones).

The product of its digits is 48600, while the sum is 40.

The square root of 3998155 is about 1999.5386967998. The cubic root of 3998155 is about 158.7156951522.

The spelling of 3998155 in words is "three million, nine hundred ninety-eight thousand, one hundred fifty-five".