1240655 has 8 divisors (see below), whose sum is σ = 1603392. Its totient is φ = 916128.

The previous prime is 1240637. The next prime is 1240667. The reversal of 1240655 is 5560421.

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 1240655 - 2⁸ = 1240399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1240655.

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 7 ways as a sum of consecutive naturals, for example, 9479 + ... + 9608.

It is an arithmetic number, because the mean of its divisors is an integer number (200424).

2^1240655 is an apocalyptic number.

1240655 is a deficient number, since it is larger than the sum of its proper divisors (362737).

1240655 is a wasteful number, since it uses less digits than its factorization.

1240655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19105.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1240655 is about 1113.8469374200. The cubic root of 1240655 is about 107.4526201880.

The spelling of 1240655 in words is "one million, two hundred forty thousand, six hundred fifty-five".