18731828 has 6 divisors (see below), whose sum is σ = 32780706. Its totient is φ = 9365912.

The previous prime is 18731809. The next prime is 18731849. The reversal of 18731828 is 82813781.

It can be written as a sum of positive squares in only one way, i.e., 14455204 + 4276624 = 3802^2 + 2068^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18731791 and 18731800.

It is a congruent number.

It is an unprimeable number.

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, 2341475 + ... + 2341482.

It is an arithmetic number, because the mean of its divisors is an integer number (5463451).

Almost surely, 2^18731828 is an apocalyptic number.

It is an amenable number.

18731828 is a deficient number, since it is larger than the sum of its proper divisors (14048878).

18731828 is a wasteful number, since it uses less digits than its factorization.

18731828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682961 (or 4682959 counting only the distinct ones).

The product of its digits is 21504, while the sum is 38.

The square root of 18731828 is about 4328.0281884479. The cubic root of 18731828 is about 265.5787895253.

The spelling of 18731828 in words is "eighteen million, seven hundred thirty-one thousand, eight hundred twenty-eight".