3181998 has 8 divisors (see below), whose sum is σ = 6364008. Its totient is φ = 1060664.

The previous prime is 3181973. The next prime is 3181999. The reversal of 3181998 is 8991813.

It is a happy number.

3181998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

3181998 is an admirable number.

It is a super-2 number, since 2×3181998² = 20250222544008, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3181999) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 265161 + ... + 265172.

It is an arithmetic number, because the mean of its divisors is an integer number (795501).

Almost surely, 2^3181998 is an apocalyptic number.

3181998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3181998 is a wasteful number, since it uses less digits than its factorization.

3181998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530338.

The product of its digits is 15552, while the sum is 39.

The square root of 3181998 is about 1783.8155734268. The cubic root of 3181998 is about 147.0844070753.

The spelling of 3181998 in words is "three million, one hundred eighty-one thousand, nine hundred ninety-eight".