1243290823 has 4 divisors (see below), whose sum is σ = 1244192488. Its totient is φ = 1242389160.

The previous prime is 1243290817. The next prime is 1243290827. The reversal of 1243290823 is 3280923421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3280923421 = 18523 ⋅177127.

It is a cyclic number.

It is not a de Polignac number, because 1243290823 - 2⁵ = 1243290791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243290827) 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, 448761 + ... + 451522.

It is an arithmetic number, because the mean of its divisors is an integer number (311048122).

Almost surely, 2^1243290823 is an apocalyptic number.

1243290823 is a deficient number, since it is larger than the sum of its proper divisors (901665).

1243290823 is an equidigital number, since it uses as much as digits as its factorization.

1243290823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901664.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 1243290823 is about 35260.3293092960. The cubic root of 1243290823 is about 1075.2866221123.

The spelling of 1243290823 in words is "one billion, two hundred forty-three million, two hundred ninety thousand, eight hundred twenty-three".