7988005 has 4 divisors (see below), whose sum is σ = 9585612. Its totient is φ = 6390400.

The previous prime is 7987957. The next prime is 7988009. The reversal of 7988005 is 5008897.

7988005 = 1998² + 1999².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5008897 = 17 ⋅294641.

It can be written as a sum of positive squares in 2 ways, for example, as 3992004 + 3996001 = 1998^2 + 1999^2 .

It is not a de Polignac number, because 7988005 - 2¹³ = 7979813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7988009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 798796 + ... + 798805.

It is an arithmetic number, because the mean of its divisors is an integer number (2396403).

Almost surely, 2^7988005 is an apocalyptic number.

7988005 is the 1999-th centered square number.

It is an amenable number.

7988005 is a deficient number, since it is larger than the sum of its proper divisors (1597607).

7988005 is a wasteful number, since it uses less digits than its factorization.

7988005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597606.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 7988005 is about 2826.3058928573. The cubic root of 7988005 is about 199.8999916667.

The spelling of 7988005 in words is "seven million, nine hundred eighty-eight thousand, five".