7997731 has 10 divisors (see below), whose sum is σ = 9332932. Its totient is φ = 6853140.

The previous prime is 7997729. The next prime is 7997741. The reversal of 7997731 is 1377997.

It is a happy number.

7997731 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7997731 - 2¹ = 7997729 is a prime.

It is a super-2 number, since 2×7997731² = 127927402296722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7997711) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 736 + ... + 4066.

Almost surely, 2^7997731 is an apocalyptic number.

7997731 is a deficient number, since it is larger than the sum of its proper divisors (1335201).

7997731 is an frugal number, since it uses more digits than its factorization.

7997731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3359 (or 3338 counting only the distinct ones).

The product of its digits is 83349, while the sum is 43.

The square root of 7997731 is about 2828.0259899796. The cubic root of 7997731 is about 199.9810898788.

It can be divided in two parts, 79977 and 31, that added together give a palindrome (80008).

The spelling of 7997731 in words is "seven million, nine hundred ninety-seven thousand, seven hundred thirty-one".