13539840 has 160 divisors (see below), whose sum is σ = 45372096. Its totient is φ = 3440640.

The previous prime is 13539811. The next prime is 13539853. The reversal of 13539840 is 4893531.

It is a tau number, because it is divible by the number of its divisors (160).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314859 + ... + 314901.

Almost surely, 2^13539840 is an apocalyptic number.

13539840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13539840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22686048).

13539840 is an abundant number, since it is smaller than the sum of its proper divisors (31832256).

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

13539840 is an equidigital number, since it uses as much as digits as its factorization.

13539840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 13539840 is about 3679.6521574736. The cubic root of 13539840 is about 238.3441576036.

The spelling of 13539840 in words is "thirteen million, five hundred thirty-nine thousand, eight hundred forty".