2218457 has 4 divisors (see below), whose sum is σ = 2221440. Its totient is φ = 2215476.

The previous prime is 2218451. The next prime is 2218519. The reversal of 2218457 is 7548122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7548122 = 2 ⋅3774061.

It is a cyclic number.

It is not a de Polignac number, because 2218457 - 2⁸ = 2218201 is a prime.

It is a d-powerful number, because it can be written as 2 + 2²¹ + 1 + 8³ + 4² + 5⁵ + 7⁶ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2218451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644 + ... + 2202.

It is an arithmetic number, because the mean of its divisors is an integer number (555360).

2^2218457 is an apocalyptic number.

It is an amenable number.

2218457 is a deficient number, since it is larger than the sum of its proper divisors (2983).

2218457 is a wasteful number, since it uses less digits than its factorization.

2218457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982.

The product of its digits is 4480, while the sum is 29.

The square root of 2218457 is about 1489.4485556742. The cubic root of 2218457 is about 130.4218446410.

The spelling of 2218457 in words is "two million, two hundred eighteen thousand, four hundred fifty-seven".