18315380 has 12 divisors (see below), whose sum is σ = 38462340. Its totient is φ = 7326144.

The previous prime is 18315371. The next prime is 18315413. The reversal of 18315380 is 8351381.

It can be written as a sum of positive squares in 2 ways, for example, as 3400336 + 14915044 = 1844^2 + 3862^2 .

It is a congruent number.

It is an unprimeable number.

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, 457865 + ... + 457904.

It is an arithmetic number, because the mean of its divisors is an integer number (3205195).

Almost surely, 2^18315380 is an apocalyptic number.

18315380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18315380 is an abundant number, since it is smaller than the sum of its proper divisors (20146960).

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

18315380 is a wasteful number, since it uses less digits than its factorization.

18315380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915778 (or 915776 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 18315380 is about 4279.6471817195. The cubic root of 18315380 is about 263.5958961416.

The spelling of 18315380 in words is "eighteen million, three hundred fifteen thousand, three hundred eighty".