857640854 has 32 divisors (see below), whose sum is σ = 1606957056. Its totient is φ = 334776960.

The previous prime is 857640853. The next prime is 857640857. The reversal of 857640854 is 458046758.

It is a junction number, because it is equal to n+sod(n) for n = 857640799 and 857640808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857640851) 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 15 ways as a sum of consecutive naturals, for example, 50744 + ... + 65499.

It is an arithmetic number, because the mean of its divisors is an integer number (50217408).

Almost surely, 2^857640854 is an apocalyptic number.

857640854 is a deficient number, since it is larger than the sum of its proper divisors (749316202).

857640854 is a wasteful number, since it uses less digits than its factorization.

857640854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116300.

The product of its (nonzero) digits is 1075200, while the sum is 47.

The square root of 857640854 is about 29285.5058689448. The cubic root of 857640854 is about 950.0981815424.

The spelling of 857640854 in words is "eight hundred fifty-seven million, six hundred forty thousand, eight hundred fifty-four".