7918989 has 8 divisors (see below), whose sum is σ = 11370912. Its totient is φ = 4873200.

The previous prime is 7918987. The next prime is 7919003. The reversal of 7918989 is 9898197.

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

It is not a de Polignac number, because 7918989 - 2¹ = 7918987 is a prime.

7918989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7918987) 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 7 ways as a sum of consecutive naturals, for example, 101487 + ... + 101564.

It is an arithmetic number, because the mean of its divisors is an integer number (1421364).

Almost surely, 2^7918989 is an apocalyptic number.

It is an amenable number.

7918989 is a deficient number, since it is larger than the sum of its proper divisors (3451923).

7918989 is a wasteful number, since it uses less digits than its factorization.

7918989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203067.

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

The square root of 7918989 is about 2814.0698285579. The cubic root of 7918989 is about 199.3226166827.

The spelling of 7918989 in words is "seven million, nine hundred eighteen thousand, nine hundred eighty-nine".