857940978 has 16 divisors (see below), whose sum is σ = 1762257600. Its totient is φ = 278251056.

The previous prime is 857940977. The next prime is 857940997. The reversal of 857940978 is 879049758.

857940978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (857940971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1932078 + ... + 1932521.

It is an arithmetic number, because the mean of its divisors is an integer number (110141100).

Almost surely, 2^857940978 is an apocalyptic number.

857940978 is an abundant number, since it is smaller than the sum of its proper divisors (904316622).

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

857940978 is a wasteful number, since it uses less digits than its factorization.

857940978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864641.

The product of its (nonzero) digits is 5080320, while the sum is 57.

The square root of 857940978 is about 29290.6295254984. The cubic root of 857940978 is about 950.2089948315.

The spelling of 857940978 in words is "eight hundred fifty-seven million, nine hundred forty thousand, nine hundred seventy-eight".