1023400243 has 4 divisors (see below), whose sum is σ = 1023511320. Its totient is φ = 1023289168.

The previous prime is 1023400201. The next prime is 1023400247. The reversal of 1023400243 is 3420043201.

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 1023400243 - 2²⁵ = 989845811 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 1023400243.

It is not an unprimeable number, because it can be changed into a prime (1023400247) 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, 40330 + ... + 60607.

It is an arithmetic number, because the mean of its divisors is an integer number (255877830).

Almost surely, 2^1023400243 is an apocalyptic number.

1023400243 is a deficient number, since it is larger than the sum of its proper divisors (111077).

1023400243 is a wasteful number, since it uses less digits than its factorization.

1023400243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111076.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 1023400243 is about 31990.6274242941. The cubic root of 1023400243 is about 1007.7400185501.

Adding to 1023400243 its reverse (3420043201), we get a palindrome (4443443444).

The spelling of 1023400243 in words is "one billion, twenty-three million, four hundred thousand, two hundred forty-three".