18449140 has 12 divisors (see below), whose sum is σ = 38743236. Its totient is φ = 7379648.

The previous prime is 18449129. The next prime is 18449143. The reversal of 18449140 is 4194481.

It can be written as a sum of positive squares in 2 ways, for example, as 10575504 + 7873636 = 3252^2 + 2806^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18449143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461209 + ... + 461248.

It is an arithmetic number, because the mean of its divisors is an integer number (3228603).

Almost surely, 2^18449140 is an apocalyptic number.

18449140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18449140 is an abundant number, since it is smaller than the sum of its proper divisors (20294096).

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

18449140 is a wasteful number, since it uses less digits than its factorization.

18449140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922466 (or 922464 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18449140 is about 4295.2462094739. The cubic root of 18449140 is about 264.2360339328.

The spelling of 18449140 in words is "eighteen million, four hundred forty-nine thousand, one hundred forty".