18144740 has 12 divisors (see below), whose sum is σ = 38103996. Its totient is φ = 7257888.

The previous prime is 18144733. The next prime is 18144743. The reversal of 18144740 is 4744181.

It can be written as a sum of positive squares in 2 ways, for example, as 12687844 + 5456896 = 3562^2 + 2336^2 .

It is not an unprimeable number, because it can be changed into a prime (18144743) 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, 453599 + ... + 453638.

It is an arithmetic number, because the mean of its divisors is an integer number (3175333).

Almost surely, 2^18144740 is an apocalyptic number.

18144740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18144740 is an abundant number, since it is smaller than the sum of its proper divisors (19959256).

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

18144740 is a wasteful number, since it uses less digits than its factorization.

18144740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907246 (or 907244 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 18144740 is about 4259.6643060222. The cubic root of 18144740 is about 262.7747207038.

The spelling of 18144740 in words is "eighteen million, one hundred forty-four thousand, seven hundred forty".