240609861 has 12 divisors (see below), whose sum is σ = 347978592. Its totient is φ = 160207656.

The previous prime is 240609851. The next prime is 240609869. The reversal of 240609861 is 168906042.

240609861 is a `hidden beast` number, since 2 + 40 + 609 + 8 + 6 + 1 = 666.

It is not a de Polignac number, because 240609861 - 2¹¹ = 240607813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240609869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8721 + ... + 23606.

It is an arithmetic number, because the mean of its divisors is an integer number (28998216).

Almost surely, 2^240609861 is an apocalyptic number.

It is an amenable number.

240609861 is a deficient number, since it is larger than the sum of its proper divisors (107368731).

240609861 is a wasteful number, since it uses less digits than its factorization.

240609861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33160 (or 33157 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 240609861 is about 15511.6040756590. The cubic root of 240609861 is about 621.9724392692.

The spelling of 240609861 in words is "two hundred forty million, six hundred nine thousand, eight hundred sixty-one".