7988581 has 4 divisors (see below), whose sum is σ = 7994700. Its totient is φ = 7982464.

The previous prime is 7988579. The next prime is 7988587. The reversal of 7988581 is 1858897.

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: 1858897 = 47 ⋅39551.

It can be written as a sum of positive squares in 2 ways, for example, as 6584356 + 1404225 = 2566^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 7988581 - 2¹ = 7988579 is a prime.

It is a super-2 number, since 2×7988581² = 127634852787122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7988587) 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, 226 + ... + 4003.

It is an arithmetic number, because the mean of its divisors is an integer number (1998675).

Almost surely, 2^7988581 is an apocalyptic number.

It is an amenable number.

7988581 is a deficient number, since it is larger than the sum of its proper divisors (6119).

7988581 is a wasteful number, since it uses less digits than its factorization.

7988581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6118.

The product of its digits is 161280, while the sum is 46.

The square root of 7988581 is about 2826.4077908186. The cubic root of 7988581 is about 199.9047963552.

The spelling of 7988581 in words is "seven million, nine hundred eighty-eight thousand, five hundred eighty-one".