18218230 has 16 divisors (see below), whose sum is σ = 33015600. Its totient is φ = 7237792.

The previous prime is 18218209. The next prime is 18218257. The reversal of 18218230 is 3281281.

It is a junction number, because it is equal to n+sod(n) for n = 18218195 and 18218204.

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, 4624 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (2063475).

Almost surely, 2^18218230 is an apocalyptic number.

18218230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18218230 is a deficient number, since it is larger than the sum of its proper divisors (14797370).

18218230 is a wasteful number, since it uses less digits than its factorization.

18218230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12383.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18218230 is about 4268.2818557354. The cubic root of 18218230 is about 263.1290070536.

The spelling of 18218230 in words is "eighteen million, two hundred eighteen thousand, two hundred thirty".