240861 has 4 divisors (see below), whose sum is σ = 321152. Its totient is φ = 160572.

The previous prime is 240859. The next prime is 240869. The reversal of 240861 is 168042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 240861 - 2¹ = 240859 is a prime.

It is a D-number.

It is a Duffinian number.

240861 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240869) 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, 40141 + ... + 40146.

It is an arithmetic number, because the mean of its divisors is an integer number (80288).

2²⁴⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

240861 is a deficient number, since it is larger than the sum of its proper divisors (80291).

240861 is an equidigital number, since it uses as much as digits as its factorization.

240861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80290.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 240861 is about 490.7759162795. The cubic root of 240861 is about 62.2188760719.

The spelling of 240861 in words is "two hundred forty thousand, eight hundred sixty-one".