1223845 has 16 divisors (see below), whose sum is σ = 1704960. Its totient is φ = 825984.

The previous prime is 1223777. The next prime is 1223857. The reversal of 1223845 is 5483221.

It is a cyclic number.

It is not a de Polignac number, because 1223845 - 2¹⁵ = 1191077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2316 + ... + 2794.

It is an arithmetic number, because the mean of its divisors is an integer number (106560).

2^1223845 is an apocalyptic number.

It is an amenable number.

1223845 is a deficient number, since it is larger than the sum of its proper divisors (481115).

1223845 is an equidigital number, since it uses as much as digits as its factorization.

1223845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564.

The product of its digits is 1920, while the sum is 25.

The square root of 1223845 is about 1106.2752821970. The cubic root of 1223845 is about 106.9651093042.

The spelling of 1223845 in words is "one million, two hundred twenty-three thousand, eight hundred forty-five".