7880857 has 2 divisors, whose sum is σ = 7880858. Its totient is φ = 7880856.

The previous prime is 7880849. The next prime is 7880863. The reversal of 7880857 is 7580887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6095961 + 1784896 = 2469^2 + 1336^2 .

It is an emirp because it is prime and its reverse (7580887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7880857 - 2³ = 7880849 is a prime.

It is not a weakly prime, because it can be changed into another prime (7880827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3940428 + 3940429.

It is an arithmetic number, because the mean of its divisors is an integer number (3940429).

Almost surely, 2^7880857 is an apocalyptic number.

It is an amenable number.

7880857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7880857 is an equidigital number, since it uses as much as digits as its factorization.

7880857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125440, while the sum is 43.

The square root of 7880857 is about 2807.2864121781. The cubic root of 7880857 is about 199.0021716386.

The spelling of 7880857 in words is "seven million, eight hundred eighty thousand, eight hundred fifty-seven".