13720785 has 32 divisors (see below), whose sum is σ = 25038720. Its totient is φ = 6355968.

The previous prime is 13720783. The next prime is 13720789. The reversal of 13720785 is 58702731.

13720785 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13720785 - 2¹ = 13720783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13720781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1246 + ... + 5384.

It is an arithmetic number, because the mean of its divisors is an integer number (782460).

Almost surely, 2^13720785 is an apocalyptic number.

13720785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13720785 is a deficient number, since it is larger than the sum of its proper divisors (11317935).

13720785 is a wasteful number, since it uses less digits than its factorization.

13720785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4177.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 13720785 is about 3704.1577990145. The cubic root of 13720785 is about 239.4011981998.

The spelling of 13720785 in words is "thirteen million, seven hundred twenty thousand, seven hundred eighty-five".