13871540 has 24 divisors (see below), whose sum is σ = 29461320. Its totient is φ = 5485568.

The previous prime is 13871537. The next prime is 13871551. The reversal of 13871540 is 4517831.

It can be written as a sum of positive squares in 4 ways, for example, as 2835856 + 11035684 = 1684^2 + 3322^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2117 + ... + 5676.

It is an arithmetic number, because the mean of its divisors is an integer number (1227555).

Almost surely, 2^13871540 is an apocalyptic number.

13871540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13871540 is an abundant number, since it is smaller than the sum of its proper divisors (15589780).

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

13871540 is a wasteful number, since it uses less digits than its factorization.

13871540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7891 (or 7889 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 13871540 is about 3724.4516374897. The cubic root of 13871540 is about 240.2748009724.

The spelling of 13871540 in words is "thirteen million, eight hundred seventy-one thousand, five hundred forty".