855871440 has 40 divisors (see below), whose sum is σ = 2653202208. Its totient is φ = 228232320.

The previous prime is 855871421. The next prime is 855871453. The reversal of 855871440 is 44178558.

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

It is a junction number, because it is equal to n+sod(n) for n = 855871392 and 855871401.

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, 1782826 + ... + 1783305.

Almost surely, 2^855871440 is an apocalyptic number.

855871440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

855871440 is an abundant number, since it is smaller than the sum of its proper divisors (1797330768).

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

855871440 is a wasteful number, since it uses less digits than its factorization.

855871440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3566147 (or 3566141 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 42.

The square root of 855871440 is about 29255.2805489881. The cubic root of 855871440 is about 949.4443435725. Note that the first 3 decimals are identical.

The spelling of 855871440 in words is "eight hundred fifty-five million, eight hundred seventy-one thousand, four hundred forty".