13581612 has 36 divisors (see below), whose sum is σ = 37453416. Its totient is φ = 4115520.

The previous prime is 13581559. The next prime is 13581613. The reversal of 13581612 is 21618531.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (13581613) 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, 16753 + ... + 17544.

Almost surely, 2^13581612 is an apocalyptic number.

13581612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13581612 is an abundant number, since it is smaller than the sum of its proper divisors (23871804).

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

13581612 is a wasteful number, since it uses less digits than its factorization.

13581612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34318 (or 34313 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 13581612 is about 3685.3238663651. The cubic root of 13581612 is about 238.5890125667.

The spelling of 13581612 in words is "thirteen million, five hundred eighty-one thousand, six hundred twelve".