13581906 has 64 divisors (see below), whose sum is σ = 31159296. Its totient is φ = 3916800.

The previous prime is 13581899. The next prime is 13581907. The reversal of 13581906 is 60918531.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13581907) 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, 99070 + ... + 99206.

It is an arithmetic number, because the mean of its divisors is an integer number (486864).

Almost surely, 2^13581906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13581906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15579648).

13581906 is an abundant number, since it is smaller than the sum of its proper divisors (17577390).

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

13581906 is a wasteful number, since it uses less digits than its factorization.

13581906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 13581906 is about 3685.3637540954. The cubic root of 13581906 is about 238.5907341263.

The spelling of 13581906 in words is "thirteen million, five hundred eighty-one thousand, nine hundred six".