1240843 has 4 divisors (see below), whose sum is σ = 1244088. Its totient is φ = 1237600.

The previous prime is 1240831. The next prime is 1240859. The reversal of 1240843 is 3480421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240843 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 958 + ... + 1843.

It is an arithmetic number, because the mean of its divisors is an integer number (311022).

2^1240843 is an apocalyptic number.

1240843 is a deficient number, since it is larger than the sum of its proper divisors (3245).

1240843 is an equidigital number, since it uses as much as digits as its factorization.

1240843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3244.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1240843 is about 1113.9313264291. The cubic root of 1240843 is about 107.4580474482.

The spelling of 1240843 in words is "one million, two hundred forty thousand, eight hundred forty-three".