13204440 has 96 divisors (see below), whose sum is σ = 43963920. Its totient is φ = 3435264.

The previous prime is 13204421. The next prime is 13204447. The reversal of 13204440 is 4440231.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13204447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15054 + ... + 15906.

Almost surely, 2^13204440 is an apocalyptic number.

13204440 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 13204440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21981960).

13204440 is an abundant number, since it is smaller than the sum of its proper divisors (30759480).

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

13204440 is a wasteful number, since it uses less digits than its factorization.

13204440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913 (or 906 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 13204440 is about 3633.7914084328. The cubic root of 13204440 is about 236.3596450823.

Adding to 13204440 its reverse (4440231), we get a palindrome (17644671).

The spelling of 13204440 in words is "thirteen million, two hundred four thousand, four hundred forty".