7981427 has 4 divisors (see below), whose sum is σ = 7990320. Its totient is φ = 7972536.

The previous prime is 7981417. The next prime is 7981433. The reversal of 7981427 is 7241897.

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: 7241897 = 13 ⋅557069.

It is a cyclic number.

It is not a de Polignac number, because 7981427 - 2⁴ = 7981411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7981417) 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, 2927 + ... + 4952.

It is an arithmetic number, because the mean of its divisors is an integer number (1997580).

Almost surely, 2^7981427 is an apocalyptic number.

7981427 is a deficient number, since it is larger than the sum of its proper divisors (8893).

7981427 is a wasteful number, since it uses less digits than its factorization.

7981427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8892.

The product of its digits is 28224, while the sum is 38.

The square root of 7981427 is about 2825.1419433367. The cubic root of 7981427 is about 199.8451050688.

The spelling of 7981427 in words is "seven million, nine hundred eighty-one thousand, four hundred twenty-seven".