1223861 has 4 divisors (see below), whose sum is σ = 1228332. Its totient is φ = 1219392.

The previous prime is 1223857. The next prime is 1223863. The reversal of 1223861 is 1683221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1683221 = 17 ⋅99013.

It can be written as a sum of positive squares in 2 ways, for example, as 1144900 + 78961 = 1070^2 + 281^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223861 - 2² = 1223857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223863) by changing a digit.

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, 1796 + ... + 2381.

It is an arithmetic number, because the mean of its divisors is an integer number (307083).

2^1223861 is an apocalyptic number.

It is an amenable number.

1223861 is a deficient number, since it is larger than the sum of its proper divisors (4471).

1223861 is an equidigital number, since it uses as much as digits as its factorization.

1223861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4470.

The product of its digits is 576, while the sum is 23.

The square root of 1223861 is about 1106.2825136465. The cubic root of 1223861 is about 106.9655754401.

The spelling of 1223861 in words is "one million, two hundred twenty-three thousand, eight hundred sixty-one".