7998418 has 4 divisors (see below), whose sum is σ = 11997630. Its totient is φ = 3999208.

The previous prime is 7998409. The next prime is 7998421. The reversal of 7998418 is 8148997.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8148997 = 337 ⋅24181.

It can be written as a sum of positive squares in only one way, i.e., 5555449 + 2442969 = 2357^2 + 1563^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999603 + ... + 1999606.

Almost surely, 2^7998418 is an apocalyptic number.

7998418 is a deficient number, since it is larger than the sum of its proper divisors (3999212).

7998418 is a wasteful number, since it uses less digits than its factorization.

7998418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999211.

The product of its digits is 145152, while the sum is 46.

The square root of 7998418 is about 2828.1474501871. The cubic root of 7998418 is about 199.9868157976.

The spelling of 7998418 in words is "seven million, nine hundred ninety-eight thousand, four hundred eighteen".