18135507 has 8 divisors (see below), whose sum is σ = 26040784. Its totient is φ = 11160288.

The previous prime is 18135499. The next prime is 18135517. The reversal of 18135507 is 70553181.

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

It is not a de Polignac number, because 18135507 - 2³ = 18135499 is a prime.

It is a super-2 number, since 2×18135507² = 657793228294098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18135517) 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, 232468 + ... + 232545.

It is an arithmetic number, because the mean of its divisors is an integer number (3255098).

Almost surely, 2^18135507 is an apocalyptic number.

18135507 is a deficient number, since it is larger than the sum of its proper divisors (7905277).

18135507 is a wasteful number, since it uses less digits than its factorization.

18135507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465029.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 18135507 is about 4258.5803972686. The cubic root of 18135507 is about 262.7301419326.

Adding to 18135507 its reverse (70553181), we get a palindrome (88688688).

The spelling of 18135507 in words is "eighteen million, one hundred thirty-five thousand, five hundred seven".