1240686 has 12 divisors (see below), whose sum is σ = 2688192. Its totient is φ = 413556.

The previous prime is 1240669. The next prime is 1240691. The reversal of 1240686 is 6860421.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34446 + ... + 34481.

It is an arithmetic number, because the mean of its divisors is an integer number (224016).

2^1240686 is an apocalyptic number.

1240686 is an abundant number, since it is smaller than the sum of its proper divisors (1447506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1240686 is a wasteful number, since it uses less digits than its factorization.

1240686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68935 (or 68932 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1240686 is about 1113.8608530692. The cubic root of 1240686 is about 107.4535151463.

The spelling of 1240686 in words is "one million, two hundred forty thousand, six hundred eighty-six".