13206840 has 64 divisors (see below), whose sum is σ = 39929760. Its totient is φ = 3494400.

The previous prime is 13206821. The next prime is 13206847. The reversal of 13206840 is 4860231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 13206840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13206847) 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, 18490 + ... + 19190.

Almost surely, 2^13206840 is an apocalyptic number.

13206840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13206840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19964880).

13206840 is an abundant number, since it is smaller than the sum of its proper divisors (26722920).

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

13206840 is a wasteful number, since it uses less digits than its factorization.

13206840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 13206840 is about 3634.1216270235. The cubic root of 13206840 is about 236.3739642251.

The spelling of 13206840 in words is "thirteen million, two hundred six thousand, eight hundred forty".