2215445 has 4 divisors (see below), whose sum is σ = 2658540. Its totient is φ = 1772352.

The previous prime is 2215417. The next prime is 2215463. The reversal of 2215445 is 5445122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5445122 = 2 ⋅2722561.

It can be written as a sum of positive squares in 2 ways, for example, as 1203409 + 1012036 = 1097^2 + 1006^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215445 - 2¹⁴ = 2199061 is a prime.

It is a d-powerful number, because it can be written as 2 + 2⁵ + 1 + 5³ + 4² + 4⁹ + 5⁹ .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2215445.

It is a congruent number.

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, 221540 + ... + 221549.

It is an arithmetic number, because the mean of its divisors is an integer number (664635).

2^2215445 is an apocalyptic number.

It is an amenable number.

2215445 is a deficient number, since it is larger than the sum of its proper divisors (443095).

2215445 is an equidigital number, since it uses as much as digits as its factorization.

2215445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443094.

The product of its digits is 1600, while the sum is 23.

The square root of 2215445 is about 1488.4370997795. The cubic root of 2215445 is about 130.3627933106.

The spelling of 2215445 in words is "two million, two hundred fifteen thousand, four hundred forty-five".