2215816 has 8 divisors (see below), whose sum is σ = 4154670. Its totient is φ = 1107904.

The previous prime is 2215793. The next prime is 2215823. The reversal of 2215816 is 6185122.

It can be written as a sum of positive squares in only one way, i.e., 1313316 + 902500 = 1146^2 + 950^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138481 + ... + 138496.

2^2215816 is an apocalyptic number.

It is an amenable number.

2215816 is a deficient number, since it is larger than the sum of its proper divisors (1938854).

2215816 is a wasteful number, since it uses less digits than its factorization.

2215816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276983 (or 276979 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 2215816 is about 1488.5617219316. The cubic root of 2215816 is about 130.3700697865.

The spelling of 2215816 in words is "two million, two hundred fifteen thousand, eight hundred sixteen".