857982905 has 32 divisors (see below), whose sum is σ = 1184668800. Its totient is φ = 591224832.

The previous prime is 857982883. The next prime is 857982907. The reversal of 857982905 is 509289758.

It is a cyclic number.

It is not a de Polignac number, because 857982905 - 2⁶ = 857982841 is a prime.

It is a super-2 number, since 2×857982905² = 1472269330544478050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (857982907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77561 + ... + 87929.

It is an arithmetic number, because the mean of its divisors is an integer number (37020900).

Almost surely, 2^857982905 is an apocalyptic number.

It is an amenable number.

857982905 is a deficient number, since it is larger than the sum of its proper divisors (326685895).

857982905 is a wasteful number, since it uses less digits than its factorization.

857982905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10473.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The square root of 857982905 is about 29291.3452234615. The cubic root of 857982905 is about 950.2244732713.

The spelling of 857982905 in words is "eight hundred fifty-seven million, nine hundred eighty-two thousand, nine hundred five".