1240689 has 8 divisors (see below), whose sum is σ = 1726272. Its totient is φ = 791120.

The previous prime is 1240669. The next prime is 1240691. The reversal of 1240689 is 9860421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1240689 - 2²⁰ = 192113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1240669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8922 + ... + 9059.

It is an arithmetic number, because the mean of its divisors is an integer number (215784).

2^1240689 is an apocalyptic number.

It is an amenable number.

1240689 is a deficient number, since it is larger than the sum of its proper divisors (485583).

1240689 is a wasteful number, since it uses less digits than its factorization.

1240689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18007.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1240689 is about 1113.8621997357. The cubic root of 1240689 is about 107.4536017544.

The spelling of 1240689 in words is "one million, two hundred forty thousand, six hundred eighty-nine".