1240823 has 4 divisors (see below), whose sum is σ = 1283640. Its totient is φ = 1198008.

The previous prime is 1240817. The next prime is 1240831. The reversal of 1240823 is 3280421.

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

It is a cyclic number.

It is not a de Polignac number, because 1240823 - 2⁴ = 1240807 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1240795 and 1240804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240423) 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, 21365 + ... + 21422.

It is an arithmetic number, because the mean of its divisors is an integer number (320910).

2^1240823 is an apocalyptic number.

1240823 is a deficient number, since it is larger than the sum of its proper divisors (42817).

1240823 is an equidigital number, since it uses as much as digits as its factorization.

1240823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42816.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1240823 is about 1113.9223491788. The cubic root of 1240823 is about 107.4574701061.

The spelling of 1240823 in words is "one million, two hundred forty thousand, eight hundred twenty-three".