7998215 has 8 divisors (see below), whose sum is σ = 9821328. Its totient is φ = 6249600.

The previous prime is 7998169. The next prime is 7998223. The reversal of 7998215 is 5128997.

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

It is not a de Polignac number, because 7998215 - 2⁸ = 7997959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18386 + ... + 18815.

It is an arithmetic number, because the mean of its divisors is an integer number (1227666).

Almost surely, 2^7998215 is an apocalyptic number.

7998215 is a deficient number, since it is larger than the sum of its proper divisors (1823113).

7998215 is a wasteful number, since it uses less digits than its factorization.

7998215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37249.

The product of its digits is 45360, while the sum is 41.

The square root of 7998215 is about 2828.1115607415. Note that the first 3 decimals coincide. The cubic root of 7998215 is about 199.9851238935.

It can be divided in two parts, 79982 and 15, that added together give a palindrome (79997).

The spelling of 7998215 in words is "seven million, nine hundred ninety-eight thousand, two hundred fifteen".