7942681 has 2 divisors, whose sum is σ = 7942682. Its totient is φ = 7942680.

The previous prime is 7942667. The next prime is 7942691. The reversal of 7942681 is 1862497.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6677056 + 1265625 = 2584^2 + 1125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7942681 is a prime.

It is a super-2 number, since 2×7942681² = 126172362935522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7942681.

It is not a weakly prime, because it can be changed into another prime (7942601) 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 as a sum of consecutive naturals, namely, 3971340 + 3971341.

It is an arithmetic number, because the mean of its divisors is an integer number (3971341).

Almost surely, 2^7942681 is an apocalyptic number.

It is an amenable number.

7942681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7942681 is an equidigital number, since it uses as much as digits as its factorization.

7942681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 7942681 is about 2818.2762462186. The cubic root of 7942681 is about 199.5211963166.

It can be divided in two parts, 79426 and 81, that added together give a cube (79507 = 43³).

The spelling of 7942681 in words is "seven million, nine hundred forty-two thousand, six hundred eighty-one".