18216830 has 16 divisors (see below), whose sum is σ = 32976720. Its totient is φ = 7245312.

The previous prime is 18216823. The next prime is 18216853. The reversal of 18216830 is 3861281.

It is a super-3 number, since 3×18216830³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18216793 and 18216802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3299 + ... + 6878.

It is an arithmetic number, because the mean of its divisors is an integer number (2061045).

Almost surely, 2^18216830 is an apocalyptic number.

18216830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18216830 is a deficient number, since it is larger than the sum of its proper divisors (14759890).

18216830 is a wasteful number, since it uses less digits than its factorization.

18216830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10363.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18216830 is about 4268.1178521686. The cubic root of 18216830 is about 263.1222667346.

The spelling of 18216830 in words is "eighteen million, two hundred sixteen thousand, eight hundred thirty".