13281816 has 32 divisors (see below), whose sum is σ = 34104240. Its totient is φ = 4307328.

The previous prime is 13281799. The next prime is 13281823. The reversal of 13281816 is 61818231.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6591 + ... + 8366.

Almost surely, 2^13281816 is an apocalyptic number.

It is an amenable number.

13281816 is an abundant number, since it is smaller than the sum of its proper divisors (20822424).

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

13281816 is a wasteful number, since it uses less digits than its factorization.

13281816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15003 (or 14999 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 13281816 is about 3644.4225880103. The cubic root of 13281816 is about 236.8204233511.

The spelling of 13281816 in words is "thirteen million, two hundred eighty-one thousand, eight hundred sixteen".