18218828 has 6 divisors (see below), whose sum is σ = 31882956. Its totient is φ = 9109412.

The previous prime is 18218821. The next prime is 18218833. The reversal of 18218828 is 82881281.

It is a junction number, because it is equal to n+sod(n) for n = 18218791 and 18218800.

It is not an unprimeable number, because it can be changed into a prime (18218821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2277350 + ... + 2277357.

It is an arithmetic number, because the mean of its divisors is an integer number (5313826).

Almost surely, 2^18218828 is an apocalyptic number.

It is an amenable number.

18218828 is a deficient number, since it is larger than the sum of its proper divisors (13664128).

18218828 is a wasteful number, since it uses less digits than its factorization.

18218828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4554711 (or 4554709 counting only the distinct ones).

The product of its digits is 16384, while the sum is 38.

The square root of 18218828 is about 4268.3519067668. The cubic root of 18218828 is about 263.1318860275.

The spelling of 18218828 in words is "eighteen million, two hundred eighteen thousand, eight hundred twenty-eight".