18040687 has 4 divisors (see below), whose sum is σ = 20617936. Its totient is φ = 15463440.

The previous prime is 18040679. The next prime is 18040691. The reversal of 18040687 is 78604081.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18040687 - 2³ = 18040679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18040637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1288614 + ... + 1288627.

It is an arithmetic number, because the mean of its divisors is an integer number (5154484).

Almost surely, 2^18040687 is an apocalyptic number.

18040687 is a deficient number, since it is larger than the sum of its proper divisors (2577249).

18040687 is an equidigital number, since it uses as much as digits as its factorization.

18040687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577248.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 18040687 is about 4247.4329894655. The cubic root of 18040687 is about 262.2714539839.

The spelling of 18040687 in words is "eighteen million, forty thousand, six hundred eighty-seven".