240005687 has 4 divisors (see below), whose sum is σ = 244073640. Its totient is φ = 235937736.

The previous prime is 240005657. The next prime is 240005719. The reversal of 240005687 is 786500042.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240005687 is a prime.

It is a super-3 number, since 3×240005687³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240005617) 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, 2033888 + ... + 2034005.

It is an arithmetic number, because the mean of its divisors is an integer number (61018410).

Almost surely, 2^240005687 is an apocalyptic number.

240005687 is a deficient number, since it is larger than the sum of its proper divisors (4067953).

240005687 is an equidigital number, since it uses as much as digits as its factorization.

240005687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4067952.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 240005687 is about 15492.1169308781. The cubic root of 240005687 is about 621.4514097162.

The spelling of 240005687 in words is "two hundred forty million, five thousand, six hundred eighty-seven".