13228040 has 96 divisors (see below), whose sum is σ = 36751320. Its totient is φ = 4257792.

The previous prime is 13228037. The next prime is 13228043. The reversal of 13228040 is 4082231.

It is an interprime number because it is at equal distance from previous prime (13228037) and next prime (13228043).

It can be written as a sum of positive squares in 4 ways, for example, as 12545764 + 682276 = 3542^2 + 826^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13228043) 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, 33122 + ... + 33518.

Almost surely, 2^13228040 is an apocalyptic number.

13228040 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 13228040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18375660).

13228040 is an abundant number, since it is smaller than the sum of its proper divisors (23523280).

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

13228040 is a wasteful number, since it uses less digits than its factorization.

13228040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 13228040 is about 3637.0372557894. The cubic root of 13228040 is about 236.5003747087.

The spelling of 13228040 in words is "thirteen million, two hundred twenty-eight thousand, forty".