13539969 has 24 divisors (see below), whose sum is σ = 20386080. Its totient is φ = 8652672.

The previous prime is 13539961. The next prime is 13539971. The reversal of 13539969 is 96993531.

It is not a de Polignac number, because 13539969 - 2³ = 13539961 is a prime.

It is a super-2 number, since 2×13539969² = 366661521041922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13539961) 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 23 ways as a sum of consecutive naturals, for example, 22537 + ... + 23129.

It is an arithmetic number, because the mean of its divisors is an integer number (849420).

Almost surely, 2^13539969 is an apocalyptic number.

It is an amenable number.

13539969 is a deficient number, since it is larger than the sum of its proper divisors (6846111).

13539969 is a wasteful number, since it uses less digits than its factorization.

13539969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 698 counting only the distinct ones).

The product of its digits is 196830, while the sum is 45.

The square root of 13539969 is about 3679.6696862626. The cubic root of 13539969 is about 238.3449145377.

It can be divided in two parts, 135 and 39969, that added together give a palindrome (40104).

The spelling of 13539969 in words is "thirteen million, five hundred thirty-nine thousand, nine hundred sixty-nine".