2215616 has 28 divisors (see below), whose sum is σ = 4736592. Its totient is φ = 1022208.

The previous prime is 2215583. The next prime is 2215639. The reversal of 2215616 is 6165122.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2215591 and 2215600.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500 + ... + 2163.

It is an arithmetic number, because the mean of its divisors is an integer number (169164).

2^2215616 is an apocalyptic number.

2215616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2215616 is an abundant number, since it is smaller than the sum of its proper divisors (2520976).

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

2215616 is a wasteful number, since it uses less digits than its factorization.

2215616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688 (or 2678 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 2215616 is about 1488.4945414747. The cubic root of 2215616 is about 130.3661472589.

The spelling of 2215616 in words is "two million, two hundred fifteen thousand, six hundred sixteen".