13228405 has 4 divisors (see below), whose sum is σ = 15874092. Its totient is φ = 10582720.

The previous prime is 13228367. The next prime is 13228409. The reversal of 13228405 is 50482231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9284209 + 3944196 = 3047^2 + 1986^2 .

It is not a de Polignac number, because 13228405 - 2¹³ = 13220213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13228405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13228409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1322836 + ... + 1322845.

It is an arithmetic number, because the mean of its divisors is an integer number (3968523).

Almost surely, 2^13228405 is an apocalyptic number.

It is an amenable number.

13228405 is a deficient number, since it is larger than the sum of its proper divisors (2645687).

13228405 is an equidigital number, since it uses as much as digits as its factorization.

13228405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645686.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 13228405 is about 3637.0874336480. The cubic root of 13228405 is about 236.5025499325.

The spelling of 13228405 in words is "thirteen million, two hundred twenty-eight thousand, four hundred five".