8187428 has 6 divisors (see below), whose sum is σ = 14328006. Its totient is φ = 4093712.

The previous prime is 8187427. The next prime is 8187449. The reversal of 8187428 is 8247818.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4831204 + 3356224 = 2198^2 + 1832^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8187391 and 8187400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8187427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1023425 + ... + 1023432.

It is an arithmetic number, because the mean of its divisors is an integer number (2388001).

Almost surely, 2^8187428 is an apocalyptic number.

It is an amenable number.

8187428 is a deficient number, since it is larger than the sum of its proper divisors (6140578).

8187428 is a wasteful number, since it uses less digits than its factorization.

8187428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046861 (or 2046859 counting only the distinct ones).

The product of its digits is 28672, while the sum is 38.

The square root of 8187428 is about 2861.3682041988. The cubic root of 8187428 is about 201.5498586668.

The spelling of 8187428 in words is "eight million, one hundred eighty-seven thousand, four hundred twenty-eight".