7971907 has 4 divisors (see below), whose sum is σ = 8102656. Its totient is φ = 7841160.

The previous prime is 7971881. The next prime is 7971911. The reversal of 7971907 is 7091797.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7971907 is a prime.

It is an Ulam number.

It is a Duffinian number.

7971907 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7971907.

It is not an unprimeable number, because it can be changed into a prime (7971307) 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 3 ways as a sum of consecutive naturals, for example, 65283 + ... + 65404.

It is an arithmetic number, because the mean of its divisors is an integer number (2025664).

Almost surely, 2^7971907 is an apocalyptic number.

7971907 is a deficient number, since it is larger than the sum of its proper divisors (130749).

7971907 is a wasteful number, since it uses less digits than its factorization.

7971907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130748.

The product of its (nonzero) digits is 27783, while the sum is 40.

The square root of 7971907 is about 2823.4565695261. The cubic root of 7971907 is about 199.7656170972.

It can be divided in two parts, 797 and 1907, that added together give a square (2704 = 52²).

The spelling of 7971907 in words is "seven million, nine hundred seventy-one thousand, nine hundred seven".