7971242 has 4 divisors (see below), whose sum is σ = 11956866. Its totient is φ = 3985620.

The previous prime is 7971239. The next prime is 7971251. The reversal of 7971242 is 2421797.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7778521 + 192721 = 2789^2 + 439^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7971199 and 7971208.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1992809 + ... + 1992812.

Almost surely, 2^7971242 is an apocalyptic number.

7971242 is a deficient number, since it is larger than the sum of its proper divisors (3985624).

7971242 is a wasteful number, since it uses less digits than its factorization.

7971242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985623.

The product of its digits is 7056, while the sum is 32.

The square root of 7971242 is about 2823.3388036153. The cubic root of 7971242 is about 199.7600622645.

The spelling of 7971242 in words is "seven million, nine hundred seventy-one thousand, two hundred forty-two".