18751240 has 16 divisors (see below), whose sum is σ = 42190380. Its totient is φ = 7500480.

The previous prime is 18751231. The next prime is 18751259. The reversal of 18751240 is 4215781.

It can be written as a sum of positive squares in 2 ways, for example, as 18507204 + 244036 = 4302^2 + 494^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18751199 and 18751208.

It is an unprimeable number.

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, 234351 + ... + 234430.

Almost surely, 2^18751240 is an apocalyptic number.

18751240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18751240 is an abundant number, since it is smaller than the sum of its proper divisors (23439140).

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

18751240 is a wasteful number, since it uses less digits than its factorization.

18751240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468792 (or 468788 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 18751240 is about 4330.2701994217. The cubic root of 18751240 is about 265.6704985960.

The spelling of 18751240 in words is "eighteen million, seven hundred fifty-one thousand, two hundred forty".