7857382009 has 2 divisors, whose sum is σ = 7857382010. Its totient is φ = 7857382008.

The previous prime is 7857381979. The next prime is 7857382021. The reversal of 7857382009 is 9002837587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4130889984 + 3726492025 = 64272^2 + 61045^2 .

It is a cyclic number.

It is not a de Polignac number, because 7857382009 - 2⁵ = 7857381977 is a prime.

It is not a weakly prime, because it can be changed into another prime (7857382079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3928691004 + 3928691005.

It is an arithmetic number, because the mean of its divisors is an integer number (3928691005).

Almost surely, 2^7857382009 is an apocalyptic number.

It is an amenable number.

7857382009 is a deficient number, since it is larger than the sum of its proper divisors (1).

7857382009 is an equidigital number, since it uses as much as digits as its factorization.

7857382009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 49.

The square root of 7857382009 is about 88641.8750309356. The cubic root of 7857382009 is about 1988.0438349024.

The spelling of 7857382009 in words is "seven billion, eight hundred fifty-seven million, three hundred eighty-two thousand, nine".