857872987 has 2 divisors, whose sum is σ = 857872988. Its totient is φ = 857872986.

The previous prime is 857872969. The next prime is 857873059. The reversal of 857872987 is 789278758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 857872987 - 2²⁷ = 723655259 is a prime.

It is not a weakly prime, because it can be changed into another prime (857872927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428936493 + 428936494.

It is an arithmetic number, because the mean of its divisors is an integer number (428936494).

Almost surely, 2^857872987 is an apocalyptic number.

857872987 is a deficient number, since it is larger than the sum of its proper divisors (1).

857872987 is an equidigital number, since it uses as much as digits as its factorization.

857872987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15805440, while the sum is 61.

The square root of 857872987 is about 29289.4688753484. The cubic root of 857872987 is about 950.1838931177.

The spelling of 857872987 in words is "eight hundred fifty-seven million, eight hundred seventy-two thousand, nine hundred eighty-seven".