13398228 has 18 divisors (see below), whose sum is σ = 33867834. Its totient is φ = 4466064.

The previous prime is 13398157. The next prime is 13398233. The reversal of 13398228 is 82289331.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7551504 + 5846724 = 2748^2 + 2418^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 372173 = 13398228 / (1 + 3 + 3 + 9 + 8 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 13398192 and 13398201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 186051 + ... + 186122.

Almost surely, 2^13398228 is an apocalyptic number.

13398228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13398228 is an abundant number, since it is smaller than the sum of its proper divisors (20469606).

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

13398228 is a wasteful number, since it uses less digits than its factorization.

13398228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372183 (or 372178 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 13398228 is about 3660.3589987869. The cubic root of 13398228 is about 237.5103035234.

The spelling of 13398228 in words is "thirteen million, three hundred ninety-eight thousand, two hundred twenty-eight".