1223520040 has 16 divisors (see below), whose sum is σ = 2752920180. Its totient is φ = 489408000.

The previous prime is 1223520019. The next prime is 1223520041. The reversal of 1223520040 is 400253221.

It can be written as a sum of positive squares in 2 ways, for example, as 1180197316 + 43322724 = 34354^2 + 6582^2 .

It is not an unprimeable number, because it can be changed into a prime (1223520041) 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, 15293961 + ... + 15294040.

Almost surely, 2^1223520040 is an apocalyptic number.

1223520040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223520040 is an abundant number, since it is smaller than the sum of its proper divisors (1529400140).

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

1223520040 is a wasteful number, since it uses less digits than its factorization.

1223520040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30588012 (or 30588008 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 1223520040 is about 34978.8513247648. The cubic root of 1223520040 is about 1069.5564120461.

Adding to 1223520040 its reverse (400253221), we get a palindrome (1623773261).

The spelling of 1223520040 in words is "one billion, two hundred twenty-three million, five hundred twenty thousand, forty".