240691 has 4 divisors (see below), whose sum is σ = 262584. Its totient is φ = 218800.

The previous prime is 240677. The next prime is 240701. The reversal of 240691 is 196042.

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 240691 - 2⁵ = 240659 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240631) 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, 10930 + ... + 10951.

It is an arithmetic number, because the mean of its divisors is an integer number (65646).

2²⁴⁰⁶⁹¹ is an apocalyptic number.

240691 is a deficient number, since it is larger than the sum of its proper divisors (21893).

240691 is a wasteful number, since it uses less digits than its factorization.

240691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21892.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 240691 is about 490.6026905756. The cubic root of 240691 is about 62.2042345728.

The spelling of 240691 in words is "two hundred forty thousand, six hundred ninety-one".