1223842 has 4 divisors (see below), whose sum is σ = 1835766. Its totient is φ = 611920.

The previous prime is 1223777. The next prime is 1223857. The reversal of 1223842 is 2483221.

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., 1002001 + 221841 = 1001^2 + 471^2 .

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 a nialpdrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305959 + ... + 305962.

2^1223842 is an apocalyptic number.

1223842 is a deficient number, since it is larger than the sum of its proper divisors (611924).

1223842 is an equidigital number, since it uses as much as digits as its factorization.

1223842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611923.

The product of its digits is 768, while the sum is 22.

The square root of 1223842 is about 1106.2739262949. The cubic root of 1223842 is about 106.9650219032.

The spelling of 1223842 in words is "one million, two hundred twenty-three thousand, eight hundred forty-two".