1220458 has 4 divisors (see below), whose sum is σ = 1830690. Its totient is φ = 610228.

The previous prime is 1220437. The next prime is 1220489. The reversal of 1220458 is 8540221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8540221 = 31 ⋅275491.

It can be written as a sum of positive squares in only one way, i.e., 762129 + 458329 = 873^2 + 677^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305113 + ... + 305116.

2^1220458 is an apocalyptic number.

1220458 is a deficient number, since it is larger than the sum of its proper divisors (610232).

1220458 is an equidigital number, since it uses as much as digits as its factorization.

1220458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610231.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1220458 is about 1104.7434091227. The cubic root of 1220458 is about 106.8663425610.

Adding to 1220458 its reverse (8540221), we get a palindrome (9760679).

The spelling of 1220458 in words is "one million, two hundred twenty thousand, four hundred fifty-eight".