13238428 has 24 divisors (see below), whose sum is σ = 27020000. Its totient is φ = 5673024.

The previous prime is 13238411. The next prime is 13238437. The reversal of 13238428 is 82483231.

It is a super-2 number, since 2×13238428² = 350511951822368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13238428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3453 + ... + 6196.

Almost surely, 2^13238428 is an apocalyptic number.

It is an amenable number.

13238428 is an abundant number, since it is smaller than the sum of its proper divisors (13781572).

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

13238428 is an equidigital number, since it uses as much as digits as its factorization.

13238428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9674 (or 9658 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 13238428 is about 3638.4650609838. The cubic root of 13238428 is about 236.5622665453.

The spelling of 13238428 in words is "thirteen million, two hundred thirty-eight thousand, four hundred twenty-eight".