7998018 has 32 divisors (see below), whose sum is σ = 18631296. Its totient is φ = 2241408.

The previous prime is 7998013. The next prime is 7998019. The reversal of 7998018 is 8108997.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7998013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430 + ... + 4022.

It is an arithmetic number, because the mean of its divisors is an integer number (582228).

Almost surely, 2^7998018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7998018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9315648).

7998018 is an abundant number, since it is smaller than the sum of its proper divisors (10633278).

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

7998018 is a wasteful number, since it uses less digits than its factorization.

7998018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 7998018 is about 2828.0767316323. The cubic root of 7998018 is about 199.9834819691.

The spelling of 7998018 in words is "seven million, nine hundred ninety-eight thousand, eighteen".