18507242 has 8 divisors (see below), whose sum is σ = 29896356. Its totient is φ = 8541792.

The previous prime is 18507241. The next prime is 18507259. The reversal of 18507242 is 24270581.

It can be written as a sum of positive squares in 2 ways, for example, as 17799961 + 707281 = 4219^2 + 841^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18507241) 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, 355883 + ... + 355934.

Almost surely, 2^18507242 is an apocalyptic number.

18507242 is a deficient number, since it is larger than the sum of its proper divisors (11389114).

18507242 is a wasteful number, since it uses less digits than its factorization.

18507242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711832.

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

The square root of 18507242 is about 4302.0044165482. The cubic root of 18507242 is about 264.5131300188.

The spelling of 18507242 in words is "eighteen million, five hundred seven thousand, two hundred forty-two".