1221842 has 4 divisors (see below), whose sum is σ = 1832766. Its totient is φ = 610920.

The previous prime is 1221823. The next prime is 1221853. The reversal of 1221842 is 2481221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 863041 + 358801 = 929^2 + 599^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305459 + ... + 305462.

2^1221842 is an apocalyptic number.

1221842 is a deficient number, since it is larger than the sum of its proper divisors (610924).

1221842 is an equidigital number, since it uses as much as digits as its factorization.

1221842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610923.

The product of its digits is 256, while the sum is 20.

The square root of 1221842 is about 1105.3696214389. The cubic root of 1221842 is about 106.9067227970.

The spelling of 1221842 in words is "one million, two hundred twenty-one thousand, eight hundred forty-two".