2403856 has 60 divisors (see below), whose sum is σ = 5809152. Its totient is φ = 943488.

The previous prime is 2403809. The next prime is 2403859. The reversal of 2403856 is 6583042.

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

It is a d-powerful number, because it can be written as 2¹³ + 4⁷ + 0 + 3⁷ + 8⁷ + 5 + 6⁷ .

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2403859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18865 + ... + 18991.

2^2403856 is an apocalyptic number.

2403856 is a gapful number since it is divisible by the number (26) 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 2403856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2904576).

2403856 is an abundant number, since it is smaller than the sum of its proper divisors (3405296).

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

2403856 is a wasteful number, since it uses less digits than its factorization.

2403856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 2403856 is about 1550.4373576511. The cubic root of 2403856 is about 133.9582553565.

Adding to 2403856 its reverse (6583042), we get a palindrome (8986898).

It can be divided in two parts, 240 and 3856, that added together give a 12-th power (4096 = 2¹²).

The spelling of 2403856 in words is "two million, four hundred three thousand, eight hundred fifty-six".