18750440 has 16 divisors (see below), whose sum is σ = 42188580. Its totient is φ = 7500160.

The previous prime is 18750437. The next prime is 18750467. The reversal of 18750440 is 4405781.

It can be written as a sum of positive squares in 2 ways, for example, as 18679684 + 70756 = 4322^2 + 266^2 .

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, 234341 + ... + 234420.

Almost surely, 2^18750440 is an apocalyptic number.

18750440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18750440 is an abundant number, since it is smaller than the sum of its proper divisors (23438140).

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

18750440 is a wasteful number, since it uses less digits than its factorization.

18750440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468772 (or 468768 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 18750440 is about 4330.1778254478. The cubic root of 18750440 is about 265.6667203673. Note that the first 3 decimals are identical.

The spelling of 18750440 in words is "eighteen million, seven hundred fifty thousand, four hundred forty".