13539620 has 12 divisors (see below), whose sum is σ = 28433244. Its totient is φ = 5415840.

The previous prime is 13539611. The next prime is 13539623. The reversal of 13539620 is 2693531.

It can be written as a sum of positive squares in 2 ways, for example, as 8620096 + 4919524 = 2936^2 + 2218^2 .

It is not an unprimeable number, because it can be changed into a prime (13539623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338471 + ... + 338510.

It is an arithmetic number, because the mean of its divisors is an integer number (2369437).

Almost surely, 2^13539620 is an apocalyptic number.

13539620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13539620 is an abundant number, since it is smaller than the sum of its proper divisors (14893624).

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

13539620 is a wasteful number, since it uses less digits than its factorization.

13539620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676990 (or 676988 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 13539620 is about 3679.6222632221. The cubic root of 13539620 is about 238.3428666972.

The spelling of 13539620 in words is "thirteen million, five hundred thirty-nine thousand, six hundred twenty".