7991247 has 16 divisors (see below), whose sum is σ = 11731968. Its totient is φ = 4798080.

The previous prime is 7991239. The next prime is 7991251. The reversal of 7991247 is 7421997.

It is not a de Polignac number, because 7991247 - 2³ = 7991239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2658 + ... + 4800.

It is an arithmetic number, because the mean of its divisors is an integer number (733248).

Almost surely, 2^7991247 is an apocalyptic number.

7991247 is a deficient number, since it is larger than the sum of its proper divisors (3740721).

7991247 is a wasteful number, since it uses less digits than its factorization.

7991247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270.

The product of its digits is 31752, while the sum is 39.

The square root of 7991247 is about 2826.8793748584. The cubic root of 7991247 is about 199.9270317147.

The spelling of 7991247 in words is "seven million, nine hundred ninety-one thousand, two hundred forty-seven".