13204240040 has 32 divisors (see below), whose sum is σ = 29713101480. Its totient is φ = 5281062912.

The previous prime is 13204239967. The next prime is 13204240069. The reversal of 13204240040 is 4004240231.

It can be written as a sum of positive squares in 4 ways, for example, as 8907961924 + 4296278116 = 94382^2 + 65546^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 13204239994 and 13204240021.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464312 + ... + 491928.

Almost surely, 2^13204240040 is an apocalyptic number.

13204240040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13204240040 is an abundant number, since it is smaller than the sum of its proper divisors (16508861440).

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

13204240040 is a wasteful number, since it uses less digits than its factorization.

13204240040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39581 (or 39577 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 13204240040 its reverse (4004240231), we get a palindrome (17208480271).

The spelling of 13204240040 in words is "thirteen billion, two hundred four million, two hundred forty thousand, forty".