1240643 has 16 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 1051776.

The previous prime is 1240637. The next prime is 1240667. The reversal of 1240643 is 3460421.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1240643 - 2⁸ = 1240387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7346 + ... + 7512.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2^1240643 is an apocalyptic number.

1240643 is a deficient number, since it is larger than the sum of its proper divisors (210877).

1240643 is a wasteful number, since it uses less digits than its factorization.

1240643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1240643 is about 1113.8415506705. The cubic root of 1240643 is about 107.4522737485.

The spelling of 1240643 in words is "one million, two hundred forty thousand, six hundred forty-three".