855959040 has 240 divisors, whose sum is σ = 3002807808. Its totient is φ = 225312768.

The previous prime is 855959029. The next prime is 855959047. The reversal of 855959040 is 40959558.

855959040 is a `hidden beast` number, since 8 + 5 + 59 + 590 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855959047) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2234689 + ... + 2235071.

Almost surely, 2^855959040 is an apocalyptic number.

855959040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855959040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1501403904).

855959040 is an abundant number, since it is smaller than the sum of its proper divisors (2146848768).

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

855959040 is a wasteful number, since it uses less digits than its factorization.

855959040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The square root of 855959040 is about 29256.7776762924. Note that the first 3 decimals coincide. The cubic root of 855959040 is about 949.4767349197.

The spelling of 855959040 in words is "eight hundred fifty-five million, nine hundred fifty-nine thousand, forty".