2455840 has 24 divisors (see below), whose sum is σ = 5802300. Its totient is φ = 982272.

The previous prime is 2455823. The next prime is 2455847. The reversal of 2455840 is 485542.

It can be written as a sum of positive squares in 2 ways, for example, as 2396304 + 59536 = 1548^2 + 244^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2455799 and 2455808.

It is not an unprimeable number, because it can be changed into a prime (2455847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7515 + ... + 7834.

2^2455840 is an apocalyptic number.

2455840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2455840 is an abundant number, since it is smaller than the sum of its proper divisors (3346460).

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

2455840 is a wasteful number, since it uses less digits than its factorization.

2455840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15364 (or 15356 counting only the distinct ones).

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

The square root of 2455840 is about 1567.1119934453. Note that the first 3 decimals coincide. The cubic root of 2455840 is about 134.9170043131.

The spelling of 2455840 in words is "two million, four hundred fifty-five thousand, eight hundred forty".