13509966 has 32 divisors (see below), whose sum is σ = 27659520. Its totient is φ = 4398336.

The previous prime is 13509943. The next prime is 13509967. The reversal of 13509966 is 66990531.

13509966 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (13509967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80815 + ... + 80981.

It is an arithmetic number, because the mean of its divisors is an integer number (864360).

Almost surely, 2^13509966 is an apocalyptic number.

13509966 is an abundant number, since it is smaller than the sum of its proper divisors (14149554).

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

13509966 is a wasteful number, since it uses less digits than its factorization.

13509966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 13509966 is about 3675.5905647936. The cubic root of 13509966 is about 238.1687361196.

The spelling of 13509966 in words is "thirteen million, five hundred nine thousand, nine hundred sixty-six".