1221358 has 8 divisors (see below), whose sum is σ = 1928520. Its totient is φ = 578520.

The previous prime is 1221299. The next prime is 1221373. The reversal of 1221358 is 8531221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16033 + ... + 16108.

It is an arithmetic number, because the mean of its divisors is an integer number (241065).

2^1221358 is an apocalyptic number.

1221358 is a deficient number, since it is larger than the sum of its proper divisors (707162).

1221358 is a wasteful number, since it uses less digits than its factorization.

1221358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32162.

The product of its digits is 480, while the sum is 22.

The square root of 1221358 is about 1105.1506684611. The cubic root of 1221358 is about 106.8926048539.

Adding to 1221358 its reverse (8531221), we get a palindrome (9752579).

The spelling of 1221358 in words is "one million, two hundred twenty-one thousand, three hundred fifty-eight".