18040787 has 4 divisors (see below), whose sum is σ = 18098016. Its totient is φ = 17983560.

The previous prime is 18040777. The next prime is 18040817. The reversal of 18040787 is 78704081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78704081 = 1171 ⋅67211.

It is a cyclic number.

It is not a de Polignac number, because 18040787 - 2⁸ = 18040531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18040777) 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, 28139 + ... + 28772.

It is an arithmetic number, because the mean of its divisors is an integer number (4524504).

Almost surely, 2^18040787 is an apocalyptic number.

18040787 is a deficient number, since it is larger than the sum of its proper divisors (57229).

18040787 is an equidigital number, since it uses as much as digits as its factorization.

18040787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57228.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 18040787 is about 4247.4447612653. Note that the first 3 decimals coincide. The cubic root of 18040787 is about 262.2719385755.

The spelling of 18040787 in words is "eighteen million, forty thousand, seven hundred eighty-seven".