7842197257 has 16 divisors (see below), whose sum is σ = 8369004672. Its totient is φ = 7322814720.

The previous prime is 7842197227. The next prime is 7842197261. The reversal of 7842197257 is 7527912487.

It is a cyclic number.

It is not a de Polignac number, because 7842197257 - 2²³ = 7833808649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7842197227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2162748 + ... + 2166370.

It is an arithmetic number, because the mean of its divisors is an integer number (523062792).

Almost surely, 2^7842197257 is an apocalyptic number.

It is an amenable number.

7842197257 is a deficient number, since it is larger than the sum of its proper divisors (526807415).

7842197257 is a wasteful number, since it uses less digits than its factorization.

7842197257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4608.

The product of its digits is 1975680, while the sum is 52.

The square root of 7842197257 is about 88556.1813596318. The cubic root of 7842197257 is about 1986.7623469970.

The spelling of 7842197257 in words is "seven billion, eight hundred forty-two million, one hundred ninety-seven thousand, two hundred fifty-seven".