2215720 has 32 divisors (see below), whose sum is σ = 5370120. Its totient is φ = 817920.

The previous prime is 2215699. The next prime is 2215777. The reversal of 2215720 is 275122.

It can be written as a sum of positive squares in 4 ways, for example, as 1943236 + 272484 = 1394^2 + 522^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1611 + ... + 2650.

2^2215720 is an apocalyptic number.

2215720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2215720 is an abundant number, since it is smaller than the sum of its proper divisors (3154400).

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

2215720 is a wasteful number, since it uses less digits than its factorization.

2215720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4285 (or 4281 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 2215720 is about 1488.5294756907. The cubic root of 2215720 is about 130.3681870027.

The spelling of 2215720 in words is "two million, two hundred fifteen thousand, seven hundred twenty".