18700240 has 40 divisors (see below), whose sum is σ = 46825128. Its totient is φ = 6904320.

The previous prime is 18700217. The next prime is 18700243. The reversal of 18700240 is 4200781.

It can be written as a sum of positive squares in 4 ways, for example, as 4016016 + 14684224 = 2004^2 + 3832^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18700243) 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 7 ways as a sum of consecutive naturals, for example, 7951 + ... + 10030.

Almost surely, 2^18700240 is an apocalyptic number.

18700240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18700240 is an abundant number, since it is smaller than the sum of its proper divisors (28124888).

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

18700240 is a wasteful number, since it uses less digits than its factorization.

18700240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18007 (or 18001 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 18700240 is about 4324.3774118363. The cubic root of 18700240 is about 265.4294212448.

The spelling of 18700240 in words is "eighteen million, seven hundred thousand, two hundred forty".