2621856 has 48 divisors (see below), whose sum is σ = 7112448. Its totient is φ = 844800.

The previous prime is 2621849. The next prime is 2621863. The reversal of 2621856 is 6581262.

It is an interprime number because it is at equal distance from previous prime (2621849) and next prime (2621863).

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2536 + ... + 3416.

It is an arithmetic number, because the mean of its divisors is an integer number (148176).

2^2621856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2621856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3556224).

2621856 is an abundant number, since it is smaller than the sum of its proper divisors (4490592).

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

2621856 is a wasteful number, since it uses less digits than its factorization.

2621856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925 (or 917 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 2621856 is about 1619.2146244399. The cubic root of 2621856 is about 137.8911134354.

The spelling of 2621856 in words is "two million, six hundred twenty-one thousand, eight hundred fifty-six".