18329380 has 12 divisors (see below), whose sum is σ = 38491740. Its totient is φ = 7331744.

The previous prime is 18329371. The next prime is 18329387. The reversal of 18329380 is 8392381.

It can be written as a sum of positive squares in 2 ways, for example, as 3904576 + 14424804 = 1976^2 + 3798^2 .

It is not an unprimeable number, because it can be changed into a prime (18329387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458215 + ... + 458254.

It is an arithmetic number, because the mean of its divisors is an integer number (3207645).

Almost surely, 2^18329380 is an apocalyptic number.

18329380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18329380 is an abundant number, since it is smaller than the sum of its proper divisors (20162360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18329380 is a wasteful number, since it uses less digits than its factorization.

18329380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916478 (or 916476 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 18329380 is about 4281.2825181247. The cubic root of 18329380 is about 263.6630419441.

The spelling of 18329380 in words is "eighteen million, three hundred twenty-nine thousand, three hundred eighty".