240009691 has 4 divisors (see below), whose sum is σ = 252641800. Its totient is φ = 227377584.

The previous prime is 240009643. The next prime is 240009701. The reversal of 240009691 is 196900042.

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 240009691 - 2¹¹ = 240007643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240009391) 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, 6316026 + ... + 6316063.

It is an arithmetic number, because the mean of its divisors is an integer number (63160450).

Almost surely, 2^240009691 is an apocalyptic number.

240009691 is a deficient number, since it is larger than the sum of its proper divisors (12632109).

240009691 is a wasteful number, since it uses less digits than its factorization.

240009691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12632108.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 240009691 is about 15492.2461573524. The cubic root of 240009691 is about 621.4548655755.

The spelling of 240009691 in words is "two hundred forty million, nine thousand, six hundred ninety-one".