8181998 has 32 divisors (see below), whose sum is σ = 14370048. Its totient is φ = 3452800.

The previous prime is 8181983. The next prime is 8182003. The reversal of 8181998 is 8991818.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48911 + ... + 49077.

It is an arithmetic number, because the mean of its divisors is an integer number (449064).

Almost surely, 2^8181998 is an apocalyptic number.

8181998 is a deficient number, since it is larger than the sum of its proper divisors (6188050).

8181998 is a wasteful number, since it uses less digits than its factorization.

8181998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328.

The product of its digits is 41472, while the sum is 44.

The square root of 8181998 is about 2860.4192000474. The cubic root of 8181998 is about 201.5052920554.

The spelling of 8181998 in words is "eight million, one hundred eighty-one thousand, nine hundred ninety-eight".