13121408 has 32 divisors (see below), whose sum is σ = 27282960. Its totient is φ = 6274048.

The previous prime is 13121371. The next prime is 13121411. The reversal of 13121408 is 80412131.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 13121408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 716 + ... + 5172.

Almost surely, 2^13121408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13121408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13641480).

13121408 is an abundant number, since it is smaller than the sum of its proper divisors (14161552).

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

13121408 is an equidigital number, since it uses as much as digits as its factorization.

13121408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4494 (or 4482 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 13121408 is about 3622.3484095266. The cubic root of 13121408 is about 235.8631783772.

Adding to 13121408 its reverse (80412131), we get a palindrome (93533539).

The spelling of 13121408 in words is "thirteen million, one hundred twenty-one thousand, four hundred eight".