13406220 has 72 divisors (see below), whose sum is σ = 41277600. Its totient is φ = 3521280.

The previous prime is 13406213. The next prime is 13406249. The reversal of 13406220 is 2260431.

It is a happy number.

13406220 is a `hidden beast` number, since 1 + 3 + 40 + 622 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 13406193 and 13406202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12256 + ... + 13304.

It is an arithmetic number, because the mean of its divisors is an integer number (573300).

Almost surely, 2^13406220 is an apocalyptic number.

13406220 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 13406220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20638800).

13406220 is an abundant number, since it is smaller than the sum of its proper divisors (27871380).

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

13406220 is a wasteful number, since it uses less digits than its factorization.

13406220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135 (or 1130 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 13406220 is about 3661.4505322345. The cubic root of 13406220 is about 237.5575188480.

Adding to 13406220 its reverse (2260431), we get a palindrome (15666651).

The spelling of 13406220 in words is "thirteen million, four hundred six thousand, two hundred twenty".