18140487 has 16 divisors (see below), whose sum is σ = 25175040. Its totient is φ = 11606400.

The previous prime is 18140467. The next prime is 18140489. The reversal of 18140487 is 78404181.

It is not a de Polignac number, because 18140487 - 2¹⁰ = 18139463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140489) 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, 11439 + ... + 12927.

It is an arithmetic number, because the mean of its divisors is an integer number (1573440).

Almost surely, 2^18140487 is an apocalyptic number.

18140487 is a deficient number, since it is larger than the sum of its proper divisors (7034553).

18140487 is a wasteful number, since it uses less digits than its factorization.

18140487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 18140487 is about 4259.1650590227. The cubic root of 18140487 is about 262.7541882480.

The spelling of 18140487 in words is "eighteen million, one hundred forty thousand, four hundred eighty-seven".