18140518 has 32 divisors (see below), whose sum is σ = 31177728. Its totient is φ = 7840800.

The previous prime is 18140503. The next prime is 18140519. The reversal of 18140518 is 81504181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45496 + ... + 45892.

It is an arithmetic number, because the mean of its divisors is an integer number (974304).

Almost surely, 2^18140518 is an apocalyptic number.

18140518 is a deficient number, since it is larger than the sum of its proper divisors (13037210).

18140518 is a wasteful number, since it uses less digits than its factorization.

18140518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508.

The product of its (nonzero) digits is 1280, while the sum is 28.

The square root of 18140518 is about 4259.1686982321. The cubic root of 18140518 is about 262.7543379201.

Adding to 18140518 its reverse (81504181), we get a palindrome (99644699).

It can be divided in two parts, 181405 and 18, that multiplied together give a triangular number (3265290 = T₂₅₅₅).

The spelling of 18140518 in words is "eighteen million, one hundred forty thousand, five hundred eighteen".