1221458 has 16 divisors (see below), whose sum is σ = 2143680. Its totient is φ = 511056.

The previous prime is 1221457. The next prime is 1221463. The reversal of 1221458 is 8541221.

It is not an unprimeable number, because it can be changed into a prime (1221457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (133980).

2^1221458 is an apocalyptic number.

1221458 is a deficient number, since it is larger than the sum of its proper divisors (922222).

1221458 is a wasteful number, since it uses less digits than its factorization.

1221458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081.

The product of its digits is 640, while the sum is 23.

The square root of 1221458 is about 1105.1959102349. The cubic root of 1221458 is about 106.8955220899.

Adding to 1221458 its reverse (8541221), we get a palindrome (9762679).

The spelling of 1221458 in words is "one million, two hundred twenty-one thousand, four hundred fifty-eight".