1220323123 has 16 divisors (see below), whose sum is σ = 1248307200. Its totient is φ = 1192790016.

The previous prime is 1220323067. The next prime is 1220323129. The reversal of 1220323123 is 3213230221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220323123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220323123.

It is not an unprimeable number, because it can be changed into a prime (1220323129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4748211 + ... + 4748467.

It is an arithmetic number, because the mean of its divisors is an integer number (78019200).

Almost surely, 2^1220323123 is an apocalyptic number.

1220323123 is a deficient number, since it is larger than the sum of its proper divisors (27984077).

1220323123 is a wasteful number, since it uses less digits than its factorization.

1220323123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1220323123 is about 34933.1235792049. The cubic root of 1220323123 is about 1068.6240569398.

Adding to 1220323123 its reverse (3213230221), we get a palindrome (4433553344).

The spelling of 1220323123 in words is "one billion, two hundred twenty million, three hundred twenty-three thousand, one hundred twenty-three".