1220823 has 6 divisors (see below), whose sum is σ = 1763424. Its totient is φ = 813876.

The previous prime is 1220819. The next prime is 1220833. The reversal of 1220823 is 3280221.

It is a happy number.

It is not a de Polignac number, because 1220823 - 2² = 1220819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220796 and 1220805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67815 + ... + 67832.

It is an arithmetic number, because the mean of its divisors is an integer number (293904).

2^1220823 is an apocalyptic number.

1220823 is a deficient number, since it is larger than the sum of its proper divisors (542601).

1220823 is a wasteful number, since it uses less digits than its factorization.

1220823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135653 (or 135650 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1220823 is about 1104.9085935045. The cubic root of 1220823 is about 106.8769949356.

The spelling of 1220823 in words is "one million, two hundred twenty thousand, eight hundred twenty-three".