7998427 has 4 divisors (see below), whose sum is σ = 8006040. Its totient is φ = 7990816.

The previous prime is 7998421. The next prime is 7998437. The reversal of 7998427 is 7248997.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7248997 = 7 ⋅1035571.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7998427 is a prime.

It is a Duffinian number.

7998427 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7998421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1918 + ... + 4435.

It is an arithmetic number, because the mean of its divisors is an integer number (2001510).

Almost surely, 2^7998427 is an apocalyptic number.

7998427 is a deficient number, since it is larger than the sum of its proper divisors (7613).

7998427 is a wasteful number, since it uses less digits than its factorization.

7998427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7612.

The product of its digits is 254016, while the sum is 46.

The square root of 7998427 is about 2828.1490413343. The cubic root of 7998427 is about 199.9868908074.

The spelling of 7998427 in words is "seven million, nine hundred ninety-eight thousand, four hundred twenty-seven".