18128330 has 32 divisors (see below), whose sum is σ = 35985600. Its totient is φ = 6520320.

The previous prime is 18128329. The next prime is 18128333. The reversal of 18128330 is 3382181.

It is a self number, because there is not a number n which added to its sum of digits gives 18128330.

It is not an unprimeable number, because it can be changed into a prime (18128333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9821 + ... + 11519.

It is an arithmetic number, because the mean of its divisors is an integer number (1124550).

Almost surely, 2^18128330 is an apocalyptic number.

18128330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18128330 is a deficient number, since it is larger than the sum of its proper divisors (17857270).

18128330 is a wasteful number, since it uses less digits than its factorization.

18128330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18128330 is about 4257.7376621863. The cubic root of 18128330 is about 262.6954794879.

The spelling of 18128330 in words is "eighteen million, one hundred twenty-eight thousand, three hundred thirty".