13805128 has 8 divisors (see below), whose sum is σ = 25884630. Its totient is φ = 6902560.

The previous prime is 13805119. The next prime is 13805147. The reversal of 13805128 is 82150831.

It can be written as a sum of positive squares in only one way, i.e., 13557124 + 248004 = 3682^2 + 498^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 13805096 and 13805105.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 862813 + ... + 862828.

Almost surely, 2^13805128 is an apocalyptic number.

It is an amenable number.

13805128 is a deficient number, since it is larger than the sum of its proper divisors (12079502).

13805128 is a wasteful number, since it uses less digits than its factorization.

13805128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1725647 (or 1725643 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 13805128 is about 3715.5252656926. The cubic root of 13805128 is about 239.8907373015.

Adding to 13805128 its reverse (82150831), we get a palindrome (95955959).

The spelling of 13805128 in words is "thirteen million, eight hundred five thousand, one hundred twenty-eight".