857257840 has 40 divisors (see below), whose sum is σ = 2079786528. Its totient is φ = 327993600.

The previous prime is 857257799. The next prime is 857257873. The reversal of 857257840 is 48752758.

857257840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231111 + ... + 234790.

Almost surely, 2^857257840 is an apocalyptic number.

857257840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

857257840 is an abundant number, since it is smaller than the sum of its proper divisors (1222528688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

857257840 is a wasteful number, since it uses less digits than its factorization.

857257840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465937 (or 465931 counting only the distinct ones).

The product of its (nonzero) digits is 627200, while the sum is 46.

The square root of 857257840 is about 29278.9658287310. The cubic root of 857257840 is about 949.9567256373.

The spelling of 857257840 in words is "eight hundred fifty-seven million, two hundred fifty-seven thousand, eight hundred forty".