7981998 has 16 divisors (see below), whose sum is σ = 15993936. Its totient is φ = 2655680.

The previous prime is 7981949. The next prime is 7981999. The reversal of 7981998 is 8991897.

It is a self number, because there is not a number n which added to its sum of digits gives 7981998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7981999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3778 + ... + 5498.

It is an arithmetic number, because the mean of its divisors is an integer number (999621).

Almost surely, 2^7981998 is an apocalyptic number.

7981998 is an abundant number, since it is smaller than the sum of its proper divisors (8011938).

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

7981998 is a wasteful number, since it uses less digits than its factorization.

7981998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499.

The product of its digits is 326592, while the sum is 51.

The square root of 7981998 is about 2825.2429983985. The cubic root of 7981998 is about 199.8498706674.

The spelling of 7981998 in words is "seven million, nine hundred eighty-one thousand, nine hundred ninety-eight".