13691718 has 24 divisors (see below), whose sum is σ = 30110808. Its totient is φ = 4495392.

The previous prime is 13691701. The next prime is 13691719. The reversal of 13691718 is 81719631.

13691718 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13691719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4471 + ... + 6882.

It is an arithmetic number, because the mean of its divisors is an integer number (1254617).

Almost surely, 2^13691718 is an apocalyptic number.

13691718 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13691718 is an abundant number, since it is smaller than the sum of its proper divisors (16419090).

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

13691718 is a wasteful number, since it uses less digits than its factorization.

13691718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11428 (or 11425 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 13691718 is about 3700.2321548789. The cubic root of 13691718 is about 239.2320243437.

The spelling of 13691718 in words is "thirteen million, six hundred ninety-one thousand, seven hundred eighteen".