18361330 has 16 divisors (see below), whose sum is σ = 35592984. Its totient is φ = 6779520.

The previous prime is 18361319. The next prime is 18361333. The reversal of 18361330 is 3316381.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15217801 + 3143529 = 3901^2 + 1773^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18361295 and 18361304.

It is not an unprimeable number, because it can be changed into a prime (18361333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70491 + ... + 70750.

Almost surely, 2^18361330 is an apocalyptic number.

18361330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18361330 is a deficient number, since it is larger than the sum of its proper divisors (17231654).

18361330 is a wasteful number, since it uses less digits than its factorization.

18361330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141261.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 18361330 is about 4285.0122520245. The cubic root of 18361330 is about 263.8161503102.

The spelling of 18361330 in words is "eighteen million, three hundred sixty-one thousand, three hundred thirty".