855590840 has 32 divisors (see below), whose sum is σ = 2073163680. Its totient is φ = 315910272.

The previous prime is 855590839. The next prime is 855590861. The reversal of 855590840 is 48095558.

It is a junction number, because it is equal to n+sod(n) for n = 855590791 and 855590800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 822164 + ... + 823203.

It is an arithmetic number, because the mean of its divisors is an integer number (64786365).

Almost surely, 2^855590840 is an apocalyptic number.

It is an amenable number.

855590840 is an abundant number, since it is smaller than the sum of its proper divisors (1217572840).

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

855590840 is a wasteful number, since it uses less digits than its factorization.

855590840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645391 (or 1645387 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 44.

The square root of 855590840 is about 29250.4844404328. The cubic root of 855590840 is about 949.3405728461.

The spelling of 855590840 in words is "eight hundred fifty-five million, five hundred ninety thousand, eight hundred forty".