857225840 has 40 divisors (see below), whose sum is σ = 2018293440. Its totient is φ = 338547456.

The previous prime is 857225807. The next prime is 857225849. The reversal of 857225840 is 48522758.

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

It is a super-2 number, since 2×857225840² = 1469672281527411200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857225849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61499 + ... + 74138.

It is an arithmetic number, because the mean of its divisors is an integer number (50457336).

Almost surely, 2^857225840 is an apocalyptic number.

857225840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

857225840 is an abundant number, since it is smaller than the sum of its proper divisors (1161067600).

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

857225840 is a wasteful number, since it uses less digits than its factorization.

857225840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135729 (or 135723 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 41.

The square root of 857225840 is about 29278.4193562426. The cubic root of 857225840 is about 949.9449053921.

The spelling of 857225840 in words is "eight hundred fifty-seven million, two hundred twenty-five thousand, eight hundred forty".