2855440 has 40 divisors (see below), whose sum is σ = 7588800. Its totient is φ = 978816.

The previous prime is 2855431. The next prime is 2855443. The reversal of 2855440 is 445582.

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

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 2855399 and 2855408.

It is not an unprimeable number, because it can be changed into a prime (2855443) 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, 1990 + ... + 3109.

It is an arithmetic number, because the mean of its divisors is an integer number (189720).

2^2855440 is an apocalyptic number.

2855440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2855440 is an abundant number, since it is smaller than the sum of its proper divisors (4733360).

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

2855440 is a wasteful number, since it uses less digits than its factorization.

2855440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5119 (or 5113 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 2855440 is about 1689.8047224458. The cubic root of 2855440 is about 141.8701451242.

The spelling of 2855440 in words is "two million, eight hundred fifty-five thousand, four hundred forty".