13685540 has 24 divisors (see below), whose sum is σ = 31352832. Its totient is φ = 4976480.

The previous prime is 13685537. The next prime is 13685557. The reversal of 13685540 is 4558631.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 13685497 and 13685506.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30884 + ... + 31323.

It is an arithmetic number, because the mean of its divisors is an integer number (1306368).

Almost surely, 2^13685540 is an apocalyptic number.

13685540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13685540 is an abundant number, since it is smaller than the sum of its proper divisors (17667292).

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

13685540 is a wasteful number, since it uses less digits than its factorization.

13685540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62227 (or 62225 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 13685540 is about 3699.3972482014. The cubic root of 13685540 is about 239.1960367050.

The spelling of 13685540 in words is "thirteen million, six hundred eighty-five thousand, five hundred forty".