1223819 has 4 divisors (see below), whose sum is σ = 1226040. Its totient is φ = 1221600.

The previous prime is 1223777. The next prime is 1223857. The reversal of 1223819 is 9183221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223819 is a prime.

It is a super-2 number, since 2×1223819² = 2995465889522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419 + ... + 1619.

It is an arithmetic number, because the mean of its divisors is an integer number (306510).

2^1223819 is an apocalyptic number.

1223819 is a deficient number, since it is larger than the sum of its proper divisors (2221).

1223819 is a wasteful number, since it uses less digits than its factorization.

1223819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220.

The product of its digits is 864, while the sum is 26.

The square root of 1223819 is about 1106.2635309907. The cubic root of 1223819 is about 106.9643518246.

The spelling of 1223819 in words is "one million, two hundred twenty-three thousand, eight hundred nineteen".