855849978 has 48 divisors (see below), whose sum is σ = 1901293056. Its totient is φ = 278108640.

The previous prime is 855849961. The next prime is 855850007. The reversal of 855849978 is 879948558.

It is a happy number.

855849978 is a `hidden beast` number, since 8 + 558 + 4 + 9 + 9 + 78 = 666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 227400 + ... + 231132.

It is an arithmetic number, because the mean of its divisors is an integer number (39610272).

Almost surely, 2^855849978 is an apocalyptic number.

855849978 is an abundant number, since it is smaller than the sum of its proper divisors (1045443078).

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

855849978 is a wasteful number, since it uses less digits than its factorization.

855849978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4059 (or 4056 counting only the distinct ones).

The product of its digits is 29030400, while the sum is 63.

The square root of 855849978 is about 29254.9137411136. The cubic root of 855849978 is about 949.4364073553.

The spelling of 855849978 in words is "eight hundred fifty-five million, eight hundred forty-nine thousand, nine hundred seventy-eight".