7971749 has 4 divisors (see below), whose sum is σ = 7981260. Its totient is φ = 7962240.

The previous prime is 7971739. The next prime is 7971757. The reversal of 7971749 is 9471797.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9471797 = 1031 ⋅9187.

It can be written as a sum of positive squares in 2 ways, for example, as 47524 + 7924225 = 218^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 7971749 - 2⁸ = 7971493 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 (7971709) 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, 3362 + ... + 5219.

It is an arithmetic number, because the mean of its divisors is an integer number (1995315).

Almost surely, 2^7971749 is an apocalyptic number.

It is an amenable number.

7971749 is a deficient number, since it is larger than the sum of its proper divisors (9511).

7971749 is an equidigital number, since it uses as much as digits as its factorization.

7971749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9510.

The product of its digits is 111132, while the sum is 44.

The square root of 7971749 is about 2823.4285894989. The cubic root of 7971749 is about 199.7642973304.

The spelling of 7971749 in words is "seven million, nine hundred seventy-one thousand, seven hundred forty-nine".