13535440420 has 24 divisors (see below), whose sum is σ = 28588735224. Its totient is φ = 5382878976.

The previous prime is 13535440397. The next prime is 13535440421. The reversal of 13535440420 is 2404453531.

It can be written as a sum of positive squares in 4 ways, for example, as 1100514276 + 12434926144 = 33174^2 + 111512^2 .

It is not an unprimeable number, because it can be changed into a prime (13535440421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1952529 + ... + 1959448.

It is an arithmetic number, because the mean of its divisors is an integer number (1191197301).

Almost surely, 2^13535440420 is an apocalyptic number.

13535440420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13535440420 is an abundant number, since it is smaller than the sum of its proper divisors (15053294804).

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

13535440420 is a wasteful number, since it uses less digits than its factorization.

13535440420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912159 (or 3912157 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 13535440420 its reverse (2404453531), we get a palindrome (15939893951).

The spelling of 13535440420 in words is "thirteen billion, five hundred thirty-five million, four hundred forty thousand, four hundred twenty".