1223815 has 8 divisors (see below), whose sum is σ = 1478880. Its totient is φ = 972192.

The previous prime is 1223777. The next prime is 1223857. The reversal of 1223815 is 5183221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1223815 - 2⁷ = 1223687 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6 + ... + 1564.

It is an arithmetic number, because the mean of its divisors is an integer number (184860).

2^1223815 is an apocalyptic number.

1223815 is a deficient number, since it is larger than the sum of its proper divisors (255065).

1223815 is a wasteful number, since it uses less digits than its factorization.

1223815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721.

The product of its digits is 480, while the sum is 22.

The square root of 1223815 is about 1106.2617231017. The cubic root of 1223815 is about 106.9642352884.

The spelling of 1223815 in words is "one million, two hundred twenty-three thousand, eight hundred fifteen".