1223401320 has 80 divisors (see below), whose sum is σ = 4111998660. Its totient is φ = 326239488.

The previous prime is 1223401273. The next prime is 1223401321. The reversal of 1223401320 is 231043221.

1223401320 is a `hidden beast` number, since 1 + 2 + 2 + 340 + 1 + 320 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 984327876 + 239073444 = 31374^2 + 15462^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1223401293 and 1223401302.

It is not an unprimeable number, because it can be changed into a prime (1223401321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 185557 + ... + 192036.

Almost surely, 2^1223401320 is an apocalyptic number.

1223401320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223401320 is an abundant number, since it is smaller than the sum of its proper divisors (2888597340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1223401320 is a wasteful number, since it uses less digits than its factorization.

1223401320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377616 (or 377603 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1223401320 is about 34977.1542581726. The cubic root of 1223401320 is about 1069.5218173684.

Adding to 1223401320 its reverse (231043221), we get a palindrome (1454444541).

The spelling of 1223401320 in words is "one billion, two hundred twenty-three million, four hundred one thousand, three hundred twenty".