7971489 has 6 divisors (see below), whose sum is σ = 11514386. Its totient is φ = 5314320.

The previous prime is 7971461. The next prime is 7971493. The reversal of 7971489 is 9841797.

It can be written as a sum of positive squares in only one way, i.e., 6671889 + 1299600 = 2583^2 + 1140^2 .

It is not a de Polignac number, because 7971489 - 2¹³ = 7963297 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (7971499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 442852 + ... + 442869.

Almost surely, 2^7971489 is an apocalyptic number.

It is an amenable number.

7971489 is a deficient number, since it is larger than the sum of its proper divisors (3542897).

7971489 is a wasteful number, since it uses less digits than its factorization.

7971489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885727 (or 885724 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 7971489 is about 2823.3825458127. The cubic root of 7971489 is about 199.7621255242.

The spelling of 7971489 in words is "seven million, nine hundred seventy-one thousand, four hundred eighty-nine".