1223859 has 16 divisors (see below), whose sum is σ = 2008832. Its totient is φ = 645408.

The previous prime is 1223857. The next prime is 1223863. The reversal of 1223859 is 9583221.

1223859 = T₅₁₇ + T₅₁₈ + ... + T₅₂₅.

It is a happy number.

It is not a de Polignac number, because 1223859 - 2¹ = 1223857 is a prime.

1223859 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1223857) 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 15 ways as a sum of consecutive naturals, for example, 1969 + ... + 2514.

It is an arithmetic number, because the mean of its divisors is an integer number (125552).

2^1223859 is an apocalyptic number.

1223859 is a deficient number, since it is larger than the sum of its proper divisors (784973).

1223859 is a wasteful number, since it uses less digits than its factorization.

1223859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4506.

The product of its digits is 4320, while the sum is 30.

The square root of 1223859 is about 1106.2816097179. The cubic root of 1223859 is about 106.9655171733.

It can be divided in two parts, 12 and 23859, that added together give a triangular number (23871 = T₂₁₈).

The spelling of 1223859 in words is "one million, two hundred twenty-three thousand, eight hundred fifty-nine".